Crossword Genius

They aren't all at sea! (7)

Ross

I believe the answer is:

sailors

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'they' is the definition.
Both the answer and definition are plural nouns.
Maybe there's an association between them I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for sailors that I've seen before include "Members of a ship's crew" , "Seamen" , "Mariners" .)

I've seen this clue in the Evening Standard.
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