Of a watery expanse (7)
I believe the answer is:
oceanic
(Other definitions for oceanic that I've seen before include "Relating to the high seas" , "vast waves?" , "description of rollers" , "Relating to great seas" , "Pelagic" .)
I believe the answer is:
oceanic
(Other definitions for oceanic that I've seen before include "Relating to the high seas" , "vast waves?" , "description of rollers" , "Relating to great seas" , "Pelagic" .)