Crossword Genius

"If you ___" ("OK, then") (3-2)

Ross

I believe the answer is:

say-so

(Other definitions for say-so that I've seen before include "Authorisation" , "Authority to make a decision" , "Go-ahead" , "Final approval" , "Authority to make or allow something to happen" .)

I've seen this clue in the Universal.
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