Flea or fly (4)

I believe the answer is:

pest

'flea or fly' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for pest that I've seen before include "Menace" , "Infernal nuisance" , "A nuisance - step on it" , "Annoying nuisance" , "Annoying person" .)

I've seen this clue in the Universal and the USA Today.

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