"This ___ my first rodeo" (4)

I believe the answer is:

isnt

(Other definitions for isnt that I've seen before include "Is not (abbrev.)" , "Tins (anag.)" , "Is not (colloq.)" , "When abridged, has none of the quality of" , "Does not happen to be" .)

I've seen this clue in the USA Today.

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