Crossword Genius

Unethical one (5)

Ross

I believe the answer is:

louse

'unethical one' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for louse that I've seen before include "Contemptible type" , "Bloodsucking parasitic insect" , "Common parasite on animals" , "Rogue" , "Wingless parasite" .)

I've seen this clue in the Newsday.com and the LA Times.
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