"Stop!," at sea (5)

I think it could be either:

avast

belay

'stop at sea' is the definition.
(nautical term for 'stop')

This is all the clue.

(Other definitions for avast that I've seen before include "eleven [CEASE] at sea" , "Stop! (naut.)" , "Stop at sea" , "shout stopping the ship" , ""stop" signal" .)

I've seen this clue in the L.A. Times Daily, The Globe and Mail, The Washington Post, The Telegraph, The New York Times and The Guardian.

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