Glamorous former lover with old nervous habit (6)
I believe the answer is:
Here is my best explanation:
'glamorous' is the definition.
'former lover with old nervous habit' is the subsidiary indication.
'former lover' becomes 'ex'.
'with' is a charade indicator (letters next to each other).
'old' becomes 'o'.
'nervous habit' becomes 'tic'.
(Other definitions for exotic that I've seen before include "Interestingly different or strange", "Colourful and glamorous from abroad", "Foreign; strikingly colourful", "From far abroad", "Foreign, strange or exciting", "Foreign; glamorous", "Strikingly strange or unusual", "Unusual, foreign", "From a foreign place" and "Unusual and interesting".)