Some meagre winnings may be increased (4)
I believe the answer is:
grew
'be increased' is the definition.
(I've seen this before)
'some meagre winnings may' is the wordplay.
'some' indicates the answer is hidden within the clue (some parts of the word are used).
'GREW' is hidden within 'meagre winnings may'.
(Other definitions for grew that I've seen before include "Increased in size" , "Sprouted" , "Got bigger" , "Multiplied" , "Expanded - flourished" .)