"Hold your horses!" (4)
(Other definitions for whoa that I've seen before include "Said to stop a horse" , "Cry for horses to stop" , "Hold your horses!" , "Command to horse to stop or stand still" , "Stop, Dobbin!" .)
'hold your horses' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for wait that I've seen before include "Watchman" , "Delay action" , "Bide one's time" , "Linger, delay" , "Hang about" .)
(Other definitions for easy does it that I've seen before include "Don't stress yourself!" , "What satisfies "Simple (4)"?" , "Take your time" , "Be careful" , "Gently" .)