Crossword Genius

Operating at speeds in excess of Mach 1 (10)

Ross

I believe the answer is:

supersonic

(Other definitions for supersonic that I've seen before include "Faster than Mach 1" , "moving very fast" , "Faster than the speed of sound" , "Very fast - 11 (anag)" .)

I've seen this clue in The Times.
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