Once more a benefit (5)

I believe the answer is:

again

'once more' is the definition.
(synonyms)

'a benefit' is the wordplay.
'benefit' becomes 'gain' (synonyms).
'a'+'gain'='AGAIN'

(Other definitions for again that I've seen before include "10 10 [AGAIN" , "One more time, encore" , "On the other hand" , "Predictably perhaps" , "Here we go ___" .)

I've seen this clue in the Evening Standard.

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