Jane --, author of 'Mansfield Park' (6)
I believe the answer is:
austen
I believe this is a double definition.
'jane' is the first definition.
(I know that jane can be written as Austen)
'author of mansfield park' is the second definition.
(I know that Mansfield Park author Austen)
(Other definitions for austen that I've seen before include "Jane, author of 'Pride and Prejudice'" , "Mansfield Park author" , "Jane ......wrote Sense and Sensibility" , "Persuasion writer" , "Future woman of note" .)