Musical performance that’s not entirely enchanted (3)
I believe the answer is:
rap
'musical performance' is the definition.
(rapping is a type of musical performance)
'not entirely enchanted' is the wordplay.
'not entirely' means to remove the last letter (most but not all of the word).
'enchanted' becomes 'rapt' (I've seen this in another clue).
'rapt' with its final letter taken away is 'RAP'.
'that's' acts as a link.
(Other definitions for rap that I've seen before include "Sharply strike; rebuke" , "Knock; type of rhythmical speech to music" , "Sharply criticise" , "Music; charge; strike" , "talking during musical performance" .)