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Pack in Reims getting away from imposters (4)

Ross

I believe the answer is:

stop

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'pack in' is the definition.
(thesaurus)

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

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(Other definitions for stop that I've seen before include "Post (anag.)" , "Hold on" , "Cease, desist, whoa" , "Standstill" , "cut out" .)

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