Generous portion of grub I got (3)

I believe the answer is:

big

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

'portion of grub i got' is the wordplay.
'portion of' indicates a hidden word.
'BIG' is hidden within 'grub i got'.

(Other definitions for big that I've seen before include "Large; generous" , "Circus tent" , "Sizeable" , "London bell" , "oversized" .)

I've seen this clue in The Times.

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