Unusual collectible (5)
(Other definitions for novel that I've seen before include "Romance - new" , "Unusual; book" , "Kim, eg" , "Fictitious prose work" , "She, for example" .)
'unusual collectible' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for curio that I've seen before include "Rare thing sought for collection" , "Object that is interesting, being rare or unusual" , "Object of interest because it is a rare or unusual" , "Oddity, rarity" , "Unusual, intriguing object" .)