Bizarre old books with one chapter (6)
I believe the answer is:
Here is my best explanation:
'bizarre' is the definition.
'old books with one chapter' is the subsidiary indication.
'old' becomes 'ex'.
'books' becomes 'ot' (abbreviation for Old Testament**).
'with' means one lot of letters go next to another.
'one' becomes 'i' (roman numeral).
'chapter' becomes 'c'.
(Other definitions for exotic that I've seen before include "Weird; alien", "Alluringly foreign", "Foreign; strikingly colourful", "Unusual, foreign", "Weird; strange", "Colourful or unusual, perhaps from abroad", "Unusual and interesting", "Strikingly strange or unusual", "Romantically strange" and "Colourful and glamorous from abroad".)