Tempts one to break the rules (5)
I believe the answer is:
lures
'tempts' is the definition.
('lure' can be a synonym of 'tempt')
'one to break the rules' is the wordplay.
'one to break' is an anagram indicator.
'rules' is an anagram of 'LURES'.
(Other definitions for lures that I've seen before include "Tempts or entices" , "Draws" , "Baits or attractions" , "Rules with decoys" , "Baits, decoys" .)