Crossword Genius

Poseidon banishing east and north winds to find 1 (6)

Ross

I believe the answer is:

isopod

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'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" .)

I've seen this clue in The Independent.
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