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!

'girl' is the definition.

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

'of' acts as a link.

Can you help me to learn more?

(Other definitions for norma that I've seen before include "Opera - ex-PM's wife" , "John Major's wife - Bellini opera" , "musical work" , "She incited Gauls v. Romans (Bellini)" , "Manor (anag.)" .)

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

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