Crossword Genius

Got in hot pants, resolved to be ruthless (4,2,7)

Ross

I believe the answer is:

stop at nothing

'be ruthless' is the definition.
(I've seen this in another clue)

'got in hot pants resolved' is the wordplay.
'resolved' indicates an anagram.
'got'+'in'+'hot'+'pants'='gotinhotpants'
'gotinhotpants' is an anagram of 'STOP AT NOTHING'.

'to' acts as a link.

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

I've seen this clue in The Everyman puzzle in The Observer.
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