Crossword Genius

Make harmless run through football team making comeback (5)

Ross

I believe the answer is:

unarm

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But I can't explain it at all! Could you help me understand?

(Other definitions for unarm that I've seen before include "Disable" , "Make harmless" , "Deprive of a weapon" , "Remove firing pieces" , "Remove weaponry from" .)

I've seen this clue in The Times.
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