Crossword Genius

Go to any lengths (4,2,7)

Ross

I believe the answer is:

stop at nothing

(Other definitions for stop at nothing that I've seen before include "3 [COUNTDOWN CONUMDRUM] will" , "Be totally ruthless" , "Ignore all scruples" , "Act ruthlessly" , "as announcers of rocket launches do?" .)

I've seen this clue in The Guardian.
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