Stroke of luck (5)

I think it could be either:

Which length description are you looking for?:

fluke

'stroke of luck' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for fluke that I've seen before include "Lucky shot" , "Accidental success" , "flounder" , "Chance happening" , "Parasitic flatworm" .)

I've seen this clue in The Mirror, the Newsday, The Guardian and The Telegraph.

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