Crossword Genius

Where one who’s in stands to gain (8)

Ross

I believe the answer is:

increase

'gain' is the definition.
(I know that gain can be written as increase)

I can't explain the remainder of the clue.

(Other definitions for increase that I've seen before include "Get bigger" , "Make larger in a sincere way" , "Grow, expand" , "What's more" , "Grow bigger" .)

I've seen this clue in The Times.
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