Dean's girl (4)

I believe the answer is:

edna

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

'girl' is the definition.
(I've seen this before)

'dean's' is the wordplay.
'dean' can be anagrammed to 'EDNA'.
Though, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for edna that I've seen before include "Girl's name; Dane (anag.)" , "Barry Humphries' Dame" , "Female Dane, oddly" , "Girl for Dane" , "- O'Brien, Ir. novelist" .)

I've seen this clue in The Irish Independent.

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