What makes perfect performance - sacrifice all round (8)
I believe the answer is:
practice
'what makes perfect' is the definition.
(I've seen this before)
'performance sacrifice all round' is the wordplay.
'performance' becomes 'act' (act is a kind of performance).
'sacrifice' becomes 'price' (I am not sure about this - if you are sure you should believe this answer much more).
'all round' is an insertion indicator.
'act' put inside 'price' is 'PRACTICE'.
Can you help me to learn more?
(Other definitions for practice that I've seen before include "Doctor's premises" , "Team of doctors" , "Custom" , "It makes perfect, 'tis said" , "''. . . . . . . . maked perfect''" .)