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