Crossword Genius

Almost all at sea? (2,3,4)

Ross

I believe the answer is:

in the main

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'at sea?' is the definition.
('the main' is an old name for the sea)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for in the main that I've seen before include "Primarily" , "All things considered" , "Where those who walked the plank finished" , "where to find water" , "Where cod and haddock may be found" .)

I've seen this clue in The Guardian.
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