Glass boat (8)
I believe the answer is:
schooner
This clue is a double definition.
'glass' is the first definition.
(schooner is a kind of glass)
'boat' is the second definition.
(schooner is a kind of sailing vessel)
(Other definitions for schooner that I've seen before include "No chores on this sailing ship" , "Sailing vessel used in former times" , "Swift sailing vessel - sherry glass" , "9 [CONTAINER" , "wooden vessel" .)