Crossword Genius

Asseverate (6)

Ross

I believe the answer is:

affirm

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

This is all the clue.

(Other definitions for affirm that I've seen before include "Publicly state" , "Declare one's commitment (to)" , "State positively" , "Confidently assert" , "Make a formal declaration (rather than an oath)" .)

I've seen this clue in The Sunday Times.
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