Crossword Genius

Pet-biting pest (4)

Ross

I believe the answer is:

flea

(Other definitions for flea that I've seen before include "Jumping bloodsucker" , "Insect (which you don't want in your ear!)" , "Small parasitic insect" , "Member of a circus?" , "Leaping insects" .)

I've seen this clue in the USA Today.
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