Boat pole used by extremists in Guadeloupe (5)
I believe the answer is:
barge
'boat' is the definition.
(I know that barge is a type of boat)
'pole used by extremists in guadeloupe' is the wordplay.
'pole' becomes 'bar' (both can mean a metal rod).
'used by' means one lot of letters go next to another.
'extremists in' suggests removing the centre.
'guadeloupe' with its centre removed is 'ge'.
'bar'+'ge'='BARGE'
(Other definitions for barge that I've seen before include "River transport" , "Roughly push one's way" , "Canal boat, towed along (5)" , "Move roughly; boat" , "Move forcefully" .)