At the end Alistair Darling introduces finance officer (9)

I believe the answer is:

treasurer

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

I can't explain the remainder of the clue.

(Other definitions for treasurer that I've seen before include "Manager of funds" , "Committee member" , "Person holding purse" , "Council official" , "Fiscal officer" .)

I've seen this clue in The Independent.

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