LONDON (Reuters) - Oil prices clawed back ground on Tuesday amid hopes for new output curbs from OPEC and its allies to offset any potential drop in demand triggered by the coronavirus outbreak. Brent crude stood at $55.02 a barrel by 0930 GMT, up 57 cents, or nearly 1.1%, and U.S. West Texas Intermediate (WTI) crude was up 95 cents, or 1.9%, at $51.06. Tuesday's gains marked a rebound after an extended slide over the last two weeks on concern over the global economic impact of China's..