The advantage of taking part in a trip, maybe (6)
I believe the answer is:
profit
'the advantage' is the definition.
(profit is a kind of advantage)
'of taking part in a trip maybe' is the wordplay.
'taking part in' indicates putting letters inside.
'maybe' indicates an anagram.
'trip' with letters rearranged gives 'prit'.
'of' going into 'prit' is 'PROFIT'.
(Other definitions for profit that I've seen before include "bonus" , "Use" , "It's gained on a transaction" , "Surplus earnings" , "Net gain after expenses" .)