Where, at sea, a canoe can be useful (5)
I believe the answer is:
ocean
'where' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'sea a canoe can be useful' is the wordplay.
'canoe' anagrams to 'OCEAN'.
Though, I am unsure how the anagram is indicated.
'at' is the link.
Can you help me to learn more?
(Other definitions for ocean that I've seen before include "lot of liquid" , "Pacific, perhaps" , "Pacific, for example" , "Huge expanse" , "Main" .)