Enter uninvited (9)
'enter uninvited' is the definition.
(an intruder enters without permission)
This is all the clue.
(Other definitions for intrude that I've seen before include "Push in unwantedly" , "Butt in, interfere" , "Gatecrash" , "Break in" , "Push in uninvited" .)
'enter uninvited' is the definition.
This is the entire clue.
(Other definitions for gatecrash that I've seen before include "join party if not wanted" , "to do so uninvited" , "Try to get in for free" , "enter without invitation" , "join party unofficially" .)