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Put in for rerun, sore and inept (9)

Ross

I believe the answer is:

interpose

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'put in' is the definition.
(synonyms)

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

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(Other definitions for interpose that I've seen before include "Place between" , "Muscle in" , "Insert between (one thing and another)" , "mediate" , "step in" .)

I've seen this clue in The Guardian.
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