"Stop right there!" (4)

I think it could be either:

halt

whoa

'stop right there' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for whoa that I've seen before include "Cry for horses to stop" , "Command for horse to slow or stop" , "The King of rock and roll" , "Command to horse to stop or stand still" , "Opposite of "Giddy-up!"" .)

I've seen this clue in The New York Times, the Universal, the USA Today, The Washington Post and the LA Times.

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