* Dollar/yen steps back from previous day's 2-1/2-week high
* Global stock market rally had dimmed yen's safe haven appeal
* Sterling firms as more political clarity emerges in Britain
By Lisa Twaronite and Masayuki Kitano
TOKYO, July 13 (Reuters) - The yen clawed back some of this week's losses in Asian trading on Wednesday, after it sank to 2-1/2-week lows reached this week as the prospects for more economic stimulus in Japan helped bolster risk sentiment.
The dollar slipped 0.5 percent to 104.20 yen. On Tuesday, the greenback scaled a peak of 104.98 yen, its highest level since June 24. For the week, the dollar was still up about 3.6 percent against the yen.
The euro fell 0.5 percent to 115.26 yen but was still up about 3.7 percent so far this week.
"There has been some profit-taking by people who were yen-short, and that led the yen to rise today," said Ayako Sera, market economist at Sumitomo Mitsui Trust Bank in Tokyo.
Part of the yen's recent weakness was also due to some investors' hopes that former U.S. Federal Reserve chair Ben Bernanke's meetings with Japanese leaders this week would herald the adoption of a "helicopter money" stimulus policy.
That term, coined by American economist Milton Friedman, was cited by Bernanke before he became Fed chairman in 2006, when talking about how central banks might finance government budgets as a way to fight deflation.
"Some investors were also hoping that 'helicopter money' was coming to Japan, but the chief cabinet secretary just explicitly said that was not going to happen, and the dollar came off," Sera said.
The dollar hit its session low of 103.95 yen shortly after Chief Cabinet Secretary Yoshihide Suga told a news conference that the Bank of Japan will decide monetary policy steps based on factors such as market movements and the economic environment, and that it was not true that the government was considering "helicopter money."
In addition to short-term profit-taking, rebounding equity markets have led investors to reduce their holdings of safe-haven assets like the yen, which had surged in the aftermath of Britain's shock vote last month to leave the European Union.
But some market participants caution against reading too much into this week's yen moves.
While the yen may ease further in the near term, a sustained drop against the dollar seems unlikely, said Daisuke Karakama, chief market economist at Mizuho Bank.
"I think these moves are nothing more than position squaring and will prove temporary," Karakama said, referring to the yen's broad retreat this week.