Neptune's domain

I think it could be either:

Which length description are you looking for?:

3,3

sea

'neptune's domain' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for sea that I've seen before include "The Med, e.g." , "& 14 Ozone" , "Watery expanse" , "host of 1d [ADVENTURE]" , "Large expanse of water" .)

I've seen this clue in the Universal, The Star Tribune and the King Feature Syndicate.

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