Crossword Genius

___ the deal (4)

Ross

I believe the answer is:

seal

(Other definitions for seal that I've seen before include "Stick down" , "Authorise - plug" , "Settle or decide - say fate" , "Ocean mammal or official stamp." , "Authenticating stamp" .)

I've seen this clue in the USA Today, The Washington Post, the LA Times and the L.A. Times Daily.
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