Song to perform without piano (3)
I believe the answer is:
lay
'song' is the definition.
(lay is a kind of song)
'perform without piano' is the wordplay.
'perform' becomes 'play' (playing is a kind of performing).
'without' is a deletion indicator.
'piano' becomes 'p'.
'play' with 'p' taken away is 'LAY'.
'to' acts as a link.
(Other definitions for lay that I've seen before include "located" , "Secular; set" , "Narrative poem" , "Song-ballad" , "Unprofessional" .)