Play gong in American study (7)
I believe the answer is:
macbeth
'play' is the definition.
(Shakespeare play)
'gong in american study' is the wordplay.
'gong' becomes 'CBE' (Commander of the Order of the British Empire award).
'in' is an insertion indicator.
'american study' becomes 'math' (math is a kind of study. I am not sure about the 'american' bit.).
'cbe' put into 'math' is 'MACBETH'.
Can you help me to learn more?
(Other definitions for macbeth that I've seen before include "Shakespeare's Scottish play, considered unlucky" , "In sleep murderer" , "piece" , "its name must not be mentioned" , "Thane of 6" .)