Crossword Genius

Under-payment? (3)

Ross

I believe the answer is:

sub

I believe this clue is a double definition.

'under' is the first definition.
(I've seen this before)

'payment?' is the second definition.
(I have seen 'Advance payment ' mean 'sub' so perhaps 'payment' could also mean 'sub')

(Other definitions for sub that I've seen before include "Contribution; a boat" , "Underwater boat" , "Junior editor" , "Reserve (abbr)" , "Loan" .)

I've seen this clue in the Evening Standard.
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