Flippers (4)

I think it could be either:

Which length description are you looking for?:

8 4*

'flippers' is the definition.
('fin' can be a synonym of 'flipper')

This is all the clue.

(Other definitions for fins that I've seen before include "Fish have them" , "Swimming gear" .)

I've seen this clue in The New York Times and the Evening Standard.

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