Bluff is vague, we hear (5)

I believe the answer is:

feint

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'bluff' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

(Other definitions for feint that I've seen before include "Pretended blow" , "Make slight movement to divert, as in fencing" , "Mock attack" , "Misleading action" , "False fencing trust sounds dim" .)

I've seen this clue in The Daily Express.

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