Sharp part of a fence, or a fan of Nicki Minaj (4)

I believe the answer is:

barb

(Other definitions for barb that I've seen before include "A thorn or a gibe" , "Backward-pointing part of a fish hook" , "Small prong on larger point" , "Arrow projection" , "Hurtful comment" .)

I've seen this clue in the USA Today.

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