Transportation to former French island (5)
I believe the answer is:
exile
'transportation' is the definition.
(I know that transportation can be written as exile)
'former french island' is the wordplay.
'former' becomes 'ex' (prefix meaning former or onetime).
'french island' becomes 'ile' ('island' in French).
'ex'+'ile'='EXILE'
'to' is the link.
(Other definitions for exile that I've seen before include "Ousted person" , "One banished" , "Expulsion from one's country" , "One barred from their native country" , "Person expelled from home country" .)