Rescue craft, if able to anyway (8)
I believe the answer is:
lifeboat
'rescue craft' is the definition.
(I know that lifeboat is a type of sea rescue vessel)
'if able to anyway' is the wordplay.
'anyway' indicates an anagram.
'if'+'able'+'to'='ifableto'
'ifableto' anagrammed gives 'LIFEBOAT'.
(Other definitions for lifeboat that I've seen before include "Vessel used in rescue" , "Take to it if the ship is sinking" , "saver, in the main" , "It carries out rescues at sea, and is carried aboard large ships" , "Sea rescue craft" .)