* PBOC unveils new step to curb offshore yuan speculation
* Fragile risk sentiment seen likely to support yen
* Oil slides in wake of lifting of sanctions against Iran
* Canadian dollar slides to near 13-year trough (Updates prices, adds comments)
By Masayuki Kitano and Ian Chua
SINGAPORE/SYDNEY, Jan 18 (Reuters) - The safe haven yen shed Monday's earlier gains after China's central bank unveiled a fresh step to curb offshore speculation in the yuan and also set a firmer guidance rate, soothing worries about the risk of a rapid fall in the yuan.
The yuan's slide to a near-five year low earlier this month had stirred renewed concerns about China's economic health and the outlook for global growth, heightening investor risk aversion.
Such concerns about the yuan eased for now, as the People's Bank of China announced a new move to curb offshore speculation in the currency, and also set a firmer midpoint rate for the yuan on Monday. dollar edged up 0.1 percent to 117.24 yen JPY= , up from a session low of 116.56 yen touched in early Asian trade on Monday as well as Friday's 4-1/2 month low of 116.51 yen.
The Australian dollar, often used as a liquid proxy for China plays, rose 0.8 percent to $0.6914, pulling away from a near seven-year low of $0.6827 set on Friday.
Still, market participants remained sceptical about the prospects for a sustained improvement in risk appetites, given the selloff in global equities seen so far in January.
"I think we will continue to see demand for yen in the short term," said Jesper Bargmann, head of trading for Nordea Bank in Singapore. "I think the market is nervous and we will see further risk aversion."
Sterling remained on the defensive, dented by worries about Britain's economic outlook and jitters over a looming referendum on British membership in the European Union.
On Monday, sterling touched a low of $1.4251 GBP=D3 , just below Friday's trough and setting a fresh 5-1/2 year low. Sterling was last up 0.1 percent at $1.4273.
The euro eased 0.2 percent against the dollar to $1.0892 EUR= .
CANADIAN DOLLAR
Earlier on Monday, investors took aim at the Canadian dollar, driving it to a near 13-year low of C$1.4650 CAD=D4 against the U.S. dollar on growing expectations the Bank of Canada will cut interest rates as early as this week.
The outlook for commodity currencies, particularly the loonie, remained bleak given expectations for further weakness in oil prices.
Oil prices hit their lowest since 2003 on Monday, as the market braced for a jump in Iranian exports after the lifting of sanctions against the country at the weekend. weakness in the price of oil continues to weigh on the Canadian economy. The BoC would need to cut at least 50 bp this year to partially counteract the continued slide in crude oil prices," analysts at Barclays (L:BARC) wrote in a note to clients.
U.S. stock exchanges will be closed on Monday in observance of Martin Luther King Jr. Day. On Tuesday, China is set to report its weakest full-year growth figure in 25 years on the back of slowing output and sagging investments. (Editing by Chris Reese and Richard Borsuk)