Jenny, perhaps, appearing in fiction as young woman (6)
I believe the answer is:
lassie
'young woman' is the definition.
(I know that lassie is a type of young woman)
'jenny perhaps appearing in fiction' is the wordplay.
'jenny perhaps' becomes 'ass' (jenny is a female ass).
'appearing in' is an insertion indicator.
'fiction' becomes 'lie' (I've seen this before).
'ass' put within 'lie' is 'LASSIE'.
'as' is the link.
(Other definitions for lassie that I've seen before include "TV series collie dog" , "Film and TV dog" , "Young Scottish girl or Hollywood lost dog" , "TV series/film dog" , "Cinema dog who went home" .)