Lazybones unusually riled (5)
I believe the answer is:
idler
'lazybones' is the definition.
(I've seen this in another clue)
'unusually riled' is the wordplay.
'unusually' is an anagram indicator.
'riled' is an anagram of 'IDLER'.
(Other definitions for idler that I've seen before include "Man off watch" , "Slacker" , "Long doleful cry" , "Lazy person" , "papers" .)