Rudely interrupt (5,2)
I believe the answer is:
barge in
'rudely interrupt' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for barge in that I've seen before include "Enter uninvited" , "Gate-crash, break into a conversation" , "Rudely intrude" , "Rudely interrupt" , "Unexpectedly enter" .)