Main geographical feature? (5)
I believe the answer is:
ocean
This clue could be a double definition.
'main' is the first definition.
(synonyms)
'geographical feature?' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
Can you help me to learn more?
(Other definitions for ocean that I've seen before include "It's pretty wet!" , "Vast sea" , "Sea - canoe (anag)" , "Salt water expanse" , "Large area of water" .)