Ticket counterfoil (4)
I believe the answer is:
stub
'ticket counterfoil' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for stub that I've seen before include "blunt thing" , "Remnant, butt" , "evidence of smoking, for example" , "Pencil or cigarette end" , "Extinguish the cigarette on a counterfoil" .)