Decoys, breaking the rules (5)
I believe the answer is:
lures
'decoys' is the definition.
(I know this)
'breaking the rules' is the wordplay.
'breaking' indicates anagramming the letters.
'rules' is an anagram of 'LURES'.
(Other definitions for lures that I've seen before include "Draws" , "Baits, decoys" , "Rules with decoys" , "Baits or attractions" , "Tempts or entices" .)