Patriarch of drama school in Yale cast you and me (9)
I believe the answer is:
aeschylus
'patriarch of drama' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'school in yale cast you and me' is the wordplay.
'school' becomes 'sch' (abbreviation).
'in' indicates putting letters inside.
'cast' indicates anagramming the letters (letters are dispersed or cast around).
'you and me' becomes 'us' (the two of us).
'yale' anagrammed gives 'aeyl'.
'sch' placed within 'aeyl' is 'aeschyl'.
'aeschyl'+'us'='AESCHYLUS'
Can you help me to learn more?
(Other definitions for aeschylus that I've seen before include "Old stager" , "classical author" , "Classical Greek playwright" , "Greek tragedian (Oresteia)" , "Old writer" .)