Crossword Genius

Parasitic insect, subject of a Donne poem (4)

Ross

I believe the answer is:

flea

(Other definitions for flea that I've seen before include "beastie?" , "high-jumper" , "Tiny parasite" , "Jumping, blood-sucking insect" , "Little jumping insect" .)

I've seen this clue in The Guardian.
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