Bouncer (6)
'bouncer' is the definition.
(thesaurus)
This is the entire clue.
(Another definition for ouster that I've seen is " Ejection".)
'bouncer' is the definition.
(guard stationed at a door)
This is all the clue.
(Other definitions for doorman that I've seen before include "Gatekeeper" , "Entrance attendant" , "hotel employee?" , "Entry attendant" , "Commissionaire" .)