E.g. Norma Jeane, ultimately a pro after surgery (5)
I believe the answer is:
opera
'e g' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'norma jeane ultimately a pro after surgery' is the wordplay.
'ultimately' suggests the final letters.
'after surgery' indicates anagramming the letters.
The last letters of 'norma jeane' are 'ae'.
'ae'+'pro'='aepro'
'aepro' anagrammed gives 'OPERA'.
Can you help me to learn more?
(Other definitions for opera that I've seen before include "Drama or comedy set to music" , "Musical piece accompanying a stage drama or comedy" , "Form of theatre" , "Musical extravaganza" , "Patience, for example" .)