Song for one
I believe the answer is:
solo
'song for one' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for solo that I've seen before include "Unaccompanied, musically or on adventure" , "On one's own, unaccompanied" , "Done by one person" , "Lone" , "Unaccompanied flight" .)