All letters redirected, watch post (5)

I believe the answer is:

remit

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

I don't understand the rest of the clue.

(Other definitions for remit that I've seen before include "Transfer - area of authority" , "The - Papers (M. Amis)" , "Orders" , "Maybe suspend" , "committee's brief" .)

I've seen this clue in The Telegraph.

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