Transport used in Isle Dauphine (4)
I believe the answer is:
sled
'transport' is the definition.
(sled is a kind of transport)
'in isle dauphine' is the wordplay.
'in' says the answer is hidden in the clue.
'SLED' is hidden within 'isle dauphine'.
'used' acts as a link.
(Other definitions for sled that I've seen before include "American toboggan" , "Winter transport" , "Sleigh" , "Tray on which to slide" , "Vehicle on runners" .)