Agree with backwards don (3)

I believe the answer is:

nod

'agree with' is the definition.
(thesaurus)

'backwards don' is the wordplay.
'backwards' is a reversal indicator.
'don' back-to-front is 'NOD'.

(Other definitions for nod that I've seen before include "Where Cain went to" , "Bob the head" , "Gesture of approval with head" , "Signify agreement" , "Assenting head gesture" .)

I've seen this clue in The Mirror.

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