Lost where a sailor is found (2,3)

I believe the answer is:

at sea

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

I can't explain the remainder of the clue.

(Other definitions for at sea that I've seen before include "All bothered and bewildered" , "Confused (in the main?)" , "On a ship (out of one's depth?)" , "stumped" , "Away from land" .)

I've seen this clue in The Hindu.

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