Crossword Genius

That's deep (3)

Ross

I believe the answer is:

sea

'that's deep' is the definition.
(the deep can mean the sea)

This is all the clue.

(Other definitions for sea that I've seen before include "one may be pounding the beach" , "Watery expanse" , "The deep" , "Lesser ocean" , "All at . . . - totally confused" .)

I've seen this clue in The Washington Post.
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