Crossword Genius

Kibitzer, e.g. (4)

Ross

I believe the answer is:

pest

(Other definitions for pest that I've seen before include "Annoying thing" , "Annoying nuisance" , "Annoyance" , "Destructive insect or other animal" , "Nuisance; half a European capital" .)

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