Jane --, author of 'Northanger Abbey' (6)
I believe the answer is:
austen
This clue is a double definition.
'jane' is the first definition.
(I know that jane can be written as Austen)
'author of northanger abbey' is the second definition.
(I know that Northanger Abbey author Austen)
(Other definitions for austen that I've seen before include "Persuasion writer" , "Jane ......wrote Sense and Sensibility" , "Author of Sense and Sensibility" , "Jane . . . . . . wrote 'Pride and Prejudice'" , "English novelist, portrayed middle-class families" .)