Reliance on wrecked boat (5,5)
I believe the answer is:
ocean liner
'boat' is the definition.
(type of ship)
'reliance on wrecked' is the wordplay.
'wrecked' indicates an anagram.
'reliance'+'on'='relianceon'
'relianceon' with letters rearranged gives 'OCEAN-LINER'.
(Other definitions for ocean liner that I've seen before include "Cruise ship" , "Craft" , "Queen Mary, for example" .)