Where Jack may be sitting next to Ted (3)

I believe the answer is:

sea

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'where jack may be sitting next to ted' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

This is the entire clue.

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(Other definitions for sea that I've seen before include "Eg, Aral, Ross, Irish" , "It's stocked with fish" , "Expanse of salt water" , "Watery expanse" , "All at . . . - totally confused" .)

I've seen this clue in the Evening Standard.

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