Dollar struggles for traction as all eyes fix on Fed

By Jemima Kelly LONDON (Reuters) - The dollar struggled to gain traction on Wednesday as investors awaited the outcome of a Federal Reserve meeting for clues on whether bets on a single U.S. interest rate rise in 2016 are justified. With investors largely in wait-and-see mode before the Fed, Australia's dollar was the biggest mover, hitting a three-week high after a measure of domestic inflation came in slightly higher than expected. Most markets were choppy, with Asian bourses closing up on the