Crossword Genius

Young bug (3)

Ross

I believe the answer is:

nit

(Other definitions for nit that I've seen before include "Egg; fool" , "Louse's egg - berk" , "Egg of a head louse" , "Egg of a louse (3)" , "Stupid person; egg" .)

I've seen this clue in the Penny Press.
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