Performance that's no good as a farewell? (4)
I believe the answer is:
solo
'performance' is the definition.
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for solo that I've seen before include "Fly aircraft" , "Lone" , "Done by one person" , "On one's own, unaccompanied" , "Whist variant" .)