Refuse to accept some dancing around piano (5)
I believe the answer is:
repel
'refuse to accept' is the definition.
(to repel from something is to refuse it)
'some dancing around piano' is the wordplay.
'some dancing' becomes 'reel' (type of dance).
'around' indicates putting letters inside.
'piano' becomes 'p' (musical abbreviation).
'reel' going around 'p' is 'REPEL'.
(Other definitions for repel that I've seen before include "Drive back or ward off" , "Sicken" , "Put off - disgust" , "Drive back - revolt" , "Nauseate" .)