Maybe only a rude song (9)
I believe the answer is:
roundelay
'song' is the definition.
(roundelay is a kind of song)
'maybe only a rude' is the wordplay.
'maybe' indicates anagramming the letters.
'only'+'a'+'rude'='onlyarude'
'onlyarude' with letters rearranged gives 'ROUNDELAY'.
(Other definitions for roundelay that I've seen before include "Slow, medieval dance, in a circle" , "Short, simple song" , "Circle dance; simple song" , "Slow dance - song with refrain" , "Slow, circling medieval dance" .)