Ramon after the sex change? (5)

I believe the answer is:

norma

I'm a little stuck... Click here to teach me more about this clue!

'the sex change?' is the definition.
The definition suggests a singular noun which matches the answer.

'ramon' is the wordplay.
'ramon' can be anagrammed to 'NORMA'.
But, I am not clear how this is indicated.

'after' is the link.

Can you help me to learn more?

(Other definitions for norma that I've seen before include "- - Jean Baker: Marilyn Monroe" , "Female" , "Game; shared supply" , "Bellini drama" , "John Major's wife - Bellini opera" .)

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