Declining (2,3,4)

I think it could be either:

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2,3,4

7,2

on the wane

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

This is the entire clue.

(Other definitions for on the wane that I've seen before include "Becoming weaker" , "Declining" , "fading" .)

I've seen this clue in the Evening Standard.

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