Verification (5)

I think it could be either:

Which length description are you looking for?:

proof

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

This is all the clue.

(Other definitions for proof that I've seen before include "Strength of spirit" , "Testimony" , "Convincing evidence" , "Clear evidence" , "mathematical tour de force" .)

I've seen this clue in the Penny Press, The Guardian, The Mirror and the Sydney Morning Herald.

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