Uninvited guest (4-7)
'uninvited guest' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for gatecrasher that I've seen before include "Uninvited guest" , "unwelcome visitor" , "Unwelcome guest" .)
'uninvited guest' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for gate-crasher that I've seen before include "Uninvited attendee" , "One getting in without an invitation" , "Uninvited party guest" , "Unwelcome guest" .)