Crossword Genius

One who destroys an operation from within (8)

Ross

I believe the answer is:

saboteur

(Other definitions for saboteur that I've seen before include "Wrecker -- sour beat (anag)" , "Deliberate destroyer" , "Abort use (anag)" , "Wrecker (of hunts?)" , "One causes damage for political reasons" .)

I've seen this clue in The Mirror.
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