Send and he’ll see how long it takes coming back (5)

I believe the answer is:

remit

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

I don't understand the rest of the clue.

(Other definitions for remit that I've seen before include "forward" , "Send payment for timer" , "Job specification" , "Scope of prescribed job" , "The - Papers (M. Amis)" .)

I've seen this clue in the Evening Standard.

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