Huge quantity
(Other definitions for scad that I've seen before include "A lot of money for American" , "fish" , "Jack" .)
'huge quantity' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ocean that I've seen before include "Large amount of water and" , "Salt water expanse" , "eg Arctic" , "Huge body of water" , "One of the Seven Seas" .)