* Britain comes under pressure at G20 to give Brexit clarity
* Hammond says UK needs time to come up with strategy
* Greater clarity on way forward possible by year end
* EU economics chief says don't delay too long (Adds Hammond comments, EU's Moscovici, background)
By William Schomberg
CHENGDU, China, July 24 (Reuters) - Britain's new finance minister Philip Hammond, under pressure from his peers from around the world, said on Sunday there could be more clarity later this year on how the country will exit the European Union.
Several nations called on Britain during weekend talks on the world economy to explain how the politically fraught Brexit process will unfold in order to avoid adding a new drag on the long and slow recovery from the financial crisis.
"It's right at the top of the agenda here at the G20," Hammond said at the end of the two-day meeting of the Group of 20 leading economies in the Chinese city of Chengdu. "It's a new factor affecting the global economic outlook and it has increased the uncertainty which the world economy faces."
Britain was plunged into its biggest political crisis in decades by the June 23 Brexit vote and so far it has resisted calls from some other EU countries to trigger quickly the two-year process for negotiating its exit from the bloc.
Prime Minister Theresa May, who has been in her job for less than two weeks, traveled to Germany and France last week to explain why she needed time to come up with an exit strategy.
The EU's top economic official, Pierre Moscovici, said the bloc understood that Britain should not be rushed but "at the same time...let's not waste time, let's not have too much uncertainty, let's act and choose as swiftly as possible."
Hammond told reporters on Sunday the two-year negotiating period, once launched, represented "quite a tight timescale" and Britain needed to go into it with clear objectives. "We have to do that before the start of the process because when we serve that notice, we need to hit the ground running," he said.
But Hammond also showed he was aware of the need for some clarity on Brexit: "What will start to reduce uncertainty is when we are able to set out more clearly the kind of arrangement we envisage going forward with the European Union."
"If our European Union partners respond to such a vision positively - obviously it will be subject to negotiation - so that there is a sense perhaps later this year that we are all on the same page in terms of where we expect to be going, I think that will send a reassuring signal to the business community and to markets," Hammond said.