Generous contribution from popular gents (5)

I believe the answer is:

large

'generous' is the definition.
('large' can be similar in meaning to 'generous')

'contribution from popular gents' is the wordplay.
'contribution from' indicates a hidden word (the concealed answer 'contributes' to the clue).
'LARGE' is hidden within 'popular gents'.

(Other definitions for large that I've seen before include "Extensive" , "Generous" , "Comprehensive" , "Sizable" , "Wide-ranging" .)

I've seen this clue in The Telegraph.

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