Big name in romance fiction (4)
I believe the answer is:
avon
'big name in romance fiction' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for avon that I've seen before include "Name of three English rivers" , "River flowing through Shakespeare's Stratford" , "English river flowing through Stratford" , "River joining Bath with Bristol" , "River flowing through Bristol to the Severn" .)