Poseidon banishing east and north winds to find 1 (6)
I believe the answer is:
isopod
'1' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for isopod that I've seen before include "Crustacean with seven pairs of legs for crawling" , "small crustacean" , "Crustacean such as a woodlouse" , "Slater, for instance" , "Member of an order of crustaceans" .)