Crossword Genius

Ain't proper? (4)

Ross

I believe the answer is:

isnt

(Other definitions for isnt that I've seen before include "Is not (abbrev.)" , "- - This A Lovely Day? (song)" , "Is not (colloq.)" , "In the present, not to be" , "denial?" .)

I've seen this clue in The Wall Street Journal.
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