Declare as true (4)

I think it could be either:

Which length description are you looking for?:

aver

'declare as true' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for aver that I've seen before include "Declare < old cattle" , "Profess" , "being assertive" , "Maintain - state" , "State; say" .)

I've seen this clue in The Sun.

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