Be repulsive as you stagger round the piano (5)
I believe the answer is:
repel
'be repulsive as you' is the definition.
I can't tell whether this defines the answer.
'stagger round the piano' is the wordplay.
'stagger' becomes 'reel' (both can mean to move around without balance).
'round' means one lot of letters goes inside another.
'the piano' becomes 'p' (musical abbreviation).
'reel' enclosing 'p' is 'REPEL'.
Can you help me to learn more?
(Other definitions for repel that I've seen before include "Nauseate" , "Sicken" , "Parry" , "push off" , "Drive back or ward off" .)