Rescue ship (7)
I believe the answer is:
deliver
I believe this is a double definition.
'rescue' is the first definition.
(I know that rescue can be written as deliver)
'ship' is the second definition.
(to deliver something using a ship)
(Other definitions for deliver that I've seen before include "Free; supply" , "Set free, provide" , "Dispatch" , "Bring letter or rescue" , "bear" .)