Original piece of fiction (5)
I believe the answer is:
novel
I believe this clue is a triple definition!
'original' is the first definition.
(similar in meaning)
'piece' is the second definition.
(I have seen 'piece of writing' mean 'novel' so perhaps 'piece' could also mean 'novel')
'of' acts as a link.
'fiction' is the third definition.
(I know that novel is a type of story)
(Other definitions for novel that I've seen before include "Book of prose fiction" , "literary work" , "She, for example" , "A work of fiction of new kind" , "Romance - new" .)