Crossword Genius

Lassie's bane (4)

Ross

I believe the answer is:

flea

(Other definitions for flea that I've seen before include "source of infestation" , "one is proverbially fit" , "Little jumper?" , "Jumping, blood-sucking insect" , "Little jumping insect" .)

I've seen this clue in the Penny Press.
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