Crossword Genius

Must, informally (5)

Ross

I believe the answer is:

gotta

'must informally' is the definition.
(I've seen this in another clue)

This is all the clue.

(Another definition for gotta that I've seen is " American must see".)

I've seen this clue in The Wall Street Journal, The New York Times, the Newsday and The Star Tribune.
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