Lazybones is uncommonly riled (5)
I believe the answer is:
idler
'lazybones' is the definition.
(thesaurus)
'uncommonly riled' is the wordplay.
'uncommonly' indicates an anagram.
'riled' is an anagram of 'IDLER'.
'is' acts as a link.
(Other definitions for idler that I've seen before include "Long doleful cry" , "Man off watch" , "Lounger" , "Layabout, loafer" , "Layabout; ship crewman not on watch" .)