Painful dive (5,4)

I think it could be either:

Which length description are you looking for?:

5,4

5,6

belly flop

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

This is the entire clue.

(Other definitions for belly flop that I've seen before include "Unfortunate dive" , "Less than elegant dive" , "Clumsy dive" , "Awkward dive" , "Painful dive" .)

I've seen this clue in The Telegraph and The Mirror.

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