Crossword Genius

Parasite - what a coincidence (5)

Ross

I believe the answer is:

fluke

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'coincidence' is the definition.
(thesaurus)

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(Other definitions for fluke that I've seen before include "Parasitic flatworm" , "Lucky happening" , "Lucky chance" , "Lucky shot" , "Lucky stroke - part of anchor" .)

I've seen this clue in The Daily Express.
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