Diminish gradually (7)

I think it could be either:

Which length description are you looking for?:

dwindle

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

This is the entire clue.

(Other definitions for dwindle that I've seen before include "Become steadily less" , "Grow less - waste away" , "Flag" , "Diminish gradually" , "Lessen; fade out" .)

I've seen this clue in the Evening Standard and The Mirror.

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