Possible Clues:

• Palace pal in unaccompanied song
• Palace pal singing without musical accompaniment
• Answer phone to accept university course on a type of singing
• Of choral music, sung without accompaniment
• Unaccompanied is better in cooking paella
• Lacking backing
• Like some college singing groups
• Without instrumental backup
• A better rice dish American put away, wanting accompaniment
• Singing without instrumental accompaniment