Theatrical work not however by one who’s gone through Yale? (7,7)
I believe the answer is:
keyhole surgery
'gone through yale?' is the definition.
The definition suggests a singular noun which matches the answer.
'theatrical work not however by one' is the wordplay.
I cannot really understand how this works, but
'work' could be 'surgery' (surgery is a kind of work) and 'surgery' is present in the answer.
'not' could be 'o' (I've seen this in other clues) and 'o' is present in the answer.
This explanation may well be incorrect...
'who's' is the link.
Can you help me to learn more?
(Another definition for keyhole surgery that I've seen is " Precise operation".)