Request that may be final (6)

I believe the answer is:

demand

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'request' is the definition.
(demand is a kind of request)

I can't explain the remainder of the clue.

(Other definitions for demand that I've seen before include "Call for - order" , "Imperious request as for payment" , "Requirement" , "Forceful request" , "Claim as due or just" .)

I've seen this clue in The Mirror.

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