Holy man in French island uprising (3)
I believe the answer is:
eli
'holy man' is the definition.
(biblical priest)
'french island uprising' is the wordplay.
'french island' becomes 'ile' ('island' in French).
'uprising' is a reversal indicator.
'ile' back-to-front is 'ELI'.
'in' is the link.
(Other definitions for eli that I've seen before include "Priest, teacher of Samuel" , "- Wallach, US actor" , "Old Testament high priest" , "Religious character" , "Priest at Shiloh (Samuel)" .)