In a state of confusion on the ocean (2,3)

I believe the answer is:

at sea

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'on the ocean' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for at sea that I've seen before include "Where to find flounders" , "cruising?" , "in the Med?" , "The men in the dock are not" , "not reached the port yet?" .)

I've seen this clue in the Evening Standard.

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