Crossword Genius

Any tactics are permitted (in a fight) (2,5,6)

Ross

I believe the answer is:

no holds barred

(Other definitions for no holds barred that I've seen before include "Free-for-all" , "there are no limitations" , "All cargo spaces are available" , "Without restrictions" , "Not observing any rules or regulations" .)

I've seen this clue in the Sydney Morning Herald.
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