Ocean bed? (5)
I believe the answer is:
berth
'ocean bed?' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for berth that I've seen before include "Accommodation on a ship" , "Bed; mooring" , "Sleeping place in ship" , "Bunk on ship or train" , "Sleeping place on board" .)