Crossword Genius

Mostly underhand offer? (6)

Ross

I believe the answer is:

submit

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'offer?' is the definition.
(thesaurus)

I don't understand how the rest of the clue works.

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(Other definitions for submit that I've seen before include "Defer to the will of another" , "Throw in the towel" , "Yield; argue" , "Yield to the control of another" , "Yield or refer to another" .)

I've seen this clue in The Times.
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