Crossword Genius

One of those Norfolk girls? (5)

Ross

I believe the answer is:

broad

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

'one' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

'of those norfolk girls?' is the wordplay.
I cannot quite see how this works, but
'of' could be 'o' and 'o' is found in the answer.
The remaining letters 'brad' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for broad that I've seen before include "East Anglian waterway" , "dame" , "Without detail; wide" , "not detailed" , "Offspring" .)

I've seen this clue in the Evening Standard.
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