Mope about elegy (4)
I believe the answer is:
poem
'elegy' is the definition.
(thesaurus)
'mope about' is the wordplay.
'about' indicates anagramming the letters.
'mope' is an anagram of 'POEM'.
(Other definitions for poem that I've seen before include "Piece of verse" , "Ode" , "Literary composition, sometimes in verse" , "Mope (anag.)" , "Mope about in verse" .)