Ocean (8)
'ocean' is the definition.
(I know that ocean can be written as sea)
This is all the clue.
(Other definitions for sea that I've seen before include "Ocean area" , "Large expanse of water" , "that's easily reached from Dover?" , "Vast expanse" , "Caspian, e.g." .)
'ocean' is the definition.
(I know that Atlantic is a ocean)
This is the entire clue.
(Other definitions for atlantic that I've seen before include "Second-largest ocean" , "What lies to the east of 10" , "Tilt a can at the ocean" , "Sea between Old and New Worlds" , "New Jersey resort" .)
'ocean' is the definition.
(I know that Pacific is a ocean)
This is the entire clue.
(Other definitions for pacific that I've seen before include "Tranquil" , "See 18" , "Conciliatory - calm" , "Peaceable" , "mild" .)