Clambake clam (7)
I believe the answer is:
steamer
'clambake clam' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for steamer that I've seen before include "Wetsuit" , "Vessel at sea or in kitchen" , "Boat, cooking vessel" , "Large vessel - cooking vessel" , "Vessel housing galley" .)