Totally lost on the ocean (2,3)

I believe the answer is:

at sea

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This might be a double definition.

'totally lost' is the first definition.
'at sea' can be an answer for 'lost' (both can mean confused or in trouble). I am not certain of the 'totally' bit.

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

Can you help me to learn more?

(Other definitions for at sea that I've seen before include "of no fixed abode" , "Confused, uncertain" , "'Filled with bewilderment (2,3)'" , "Bewildered; sailing" , "Voyaging" .)

I've seen this clue in The Sun.

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