A girl of Roman extraction (5)

I believe the answer is:

norma

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

'a girl' is the definition.

'roman extraction' is the wordplay.
'roman' anagrams to 'NORMA'.
Though, I'm unsure how this is indicated.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for norma that I've seen before include "Outdoor function" , "Roman (anag) -- opera" , "Girl" , "Marilyn Monroe's real first name" , "Bellini work" .)

I've seen this clue in The Globe and Mail.

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