Become weaker (4)

I think it could be either:

fade

wane

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

This is all the clue.

(Other definitions for wane that I've seen before include "Grow smaller like the moon" , "Diminish" , "Get smaller" , "Become weaker" , "Decline (in influence)" .)

I've seen this clue in The Telegraph, The Times, The Guardian, The Sunday Times, The Washington Post and The Wall Street Journal.

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