Crossword Genius

Certain parasite (5)

Ross

I believe the answer is:

louse

(Other definitions for louse that I've seen before include "Unpleasant person" , "Despicable type (of insect?)" , "Insect -- nasty character, undeserving of respect" , "Rogue" , "Common parasite on animals" .)

I've seen this clue in The Star Tribune.
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