Presentation for each class with master introducing Newton (11)
I believe the answer is:
performance
'presentation' is the definition.
(performance is a kind of presentation)
'each class with master introducing newton' is the wordplay.
'each' becomes 'per' ('per' can mean for each).
'class with' becomes 'form' (form class is a kind of class. I am not sure about the 'with' bit.).
'master' becomes 'ace' (ace can mean an expert).
'introducing' means one lot of letters goes inside another (some letters introduced or inserted into others).
'newton' becomes 'N' (symbol for the scientific unit of force).
'ace' going around 'n' is 'ance'.
'per'+'form'+'ance'='PERFORMANCE'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for performance that I've seen before include "(Actor's) rendering of a role" , "Execution" , "Stage show" , "Presentation" , "What actor gives in role" .)