Lazybones may be riled (5)
I believe the answer is:
'lazybones' is the definition.
(I've seen this before)
'may be riled' is the wordplay.
'may' indicates anagramming the letters (I've seen 'might' mean this (I've seen this in other clues)).
'riled' is an anagram of 'IDLER'.
(Other definitions for idler that I've seen before include "Layabout; ship crewman not on watch", "Unpowered guide pulley", "One who doesn't want to work", "one averse to work", "Layabout, loafer".)