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Parasite from the Capital of South Korea, possibly (5)

Ross

I believe the answer is:

louse

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'parasite' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for louse that I've seen before include "Common parasite on animals" , "Rogue" , "Parasite; nasty person" , "Unpleasant person" , "Wingless bloodsucker" .)

I've seen this clue in the Sydney Morning Herald.
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