Crossword Genius

Ibsen heroine an overthinker, it’s said (4)

Ross

I believe the answer is:

nora

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

'ibsen heroine' is the definition.
(I've seen this in another clue)

'an overthinker it's said' is the wordplay.
I cannot really understand how this works, but
'an' could be 'a' and 'a' is located in the answer.
The remaining letters 'nor' 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 nora that I've seen before include "Girl's name" , "Woman" , "-- Batty (Last of the Summer Wine)" .)

I've seen this clue in the Sydney Morning Herald.
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