Disregarding rules, unfair (5,3,4)

I believe the answer is:

below the belt

(Other definitions for below the belt that I've seen before include "Where unfair blow lands" , "In an unscrupulous or cowardly way" , "In an unfair manner" , "Hang scabbard here" , "Foul landing place for blow" .)

I've seen this clue in The Mirror.

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