Bloodsucking organism (5)

I believe the answer is:

leech

(Other definitions for leech that I've seen before include "One used to bleed" , "Archaic word for physician" , "Blood-sucking worm or parasitical person" , "Worm - sponger" , "Bloodsucking annelid" .)

I've seen this clue in The Washington Post.

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