Crossword Genius

Equivalent of "ain't" (4)

Ross

I believe the answer is:

isnt

(Other definitions for isnt that I've seen before include "Is not (colloq.)" , "Does not happen to be" , "Is not (abbrev.)" , "- - This A Lovely Day? (song)" , "Tins (anag.)" .)

I've seen this clue in the USA Today and the Universal.
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