Deportation to former French island (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
exile
'deportation' is the definition.
('exile' can be a synonym of 'deportation')
'former french island' is the wordplay.
'former' becomes 'ex'.
'french island' becomes 'ile' (French for 'island').
'ex'+'ile'='EXILE'
'to' acts as a link.
(Other definitions for exile that I've seen before include "Refugee" , "Banishment from home" , "Expatriate" , "Person forced to live abroad" , "One barred from their native country" .)