Unusual romance (5)
I believe the answer is:
novel
This clue is a double definition.
'unusual' is the first definition.
(I've seen this before)
'romance' is the second definition.
(I've seen this before)
(Other definitions for novel that I've seen before include "Previously unknown" , "story" , "Kim, eg" , "New sort of fiction?" , "piece of writing" .)