Bizarre old books with one chapter (6)
I believe the answer is:
exotic
'bizarre' is the definition.
(I've seen this before)
'old books with one chapter' is the wordplay.
'old' becomes 'ex'.
'books' becomes 'ot' (Old Testament).
'with' is a charade indicator (letters next to each other).
'one' becomes 'i' (Roman numeral).
'chapter' becomes 'c'.
'ex'+'ot'+'i'+'c'='EXOTIC'
(Other definitions for exotic that I've seen before include "Strange, rare or foreign" , "Foreign, strange or exciting" , "Colourful or unusual, perhaps from abroad" , "Alluringly foreign" , "Bizarre" .)