State positively and confidently (6)

I believe the answer is:

assure

'state positively and confidently' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for assure that I've seen before include "Make (something) certain to happen" , "Give confidence to" , "Say positively" , "Guarantee, promise" , "Convince, promise" .)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.

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