Joint that may be violated (8)
I believe the answer is:
dovetail
'joint' is the definition.
(dovetail joint is a kind of joint)
'may be violated' is the wordplay.
'may' indicates an anagram (I've seen 'might' mean this (I've seen this in other clues)).
'violated' with letters rearranged gives 'DOVETAIL'.
'that' is the link.
(Other definitions for dovetail that I've seen before include "Come together" , "good joint" , "Joint - fit neatly" , "Fit together well" , "Joint with fan-shaped tenon" .)