One who makes arrangements fast? (5)

I believe the answer is:

fixer

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'one who makes arrangements' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for fixer that I've seen before include "One who makes arrangements" , "Chemical in photography" , "Agent" .)

I've seen this clue in The Globe and Mail.

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