Sets up personnel schedule limiting time on one copier (8)

I believe the answer is:

imitator

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'copier' is the definition.
(thesaurus)

I can't explain the rest of the clue.

(Other definitions for imitator that I've seen before include "Copier (of another)" , "One who copies another" , "A trio, Tim, is a mimic" , "Ape" , "Someone copying the behaviour of another" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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