Counterfoil (4)
I believe the answer is:
stub
'counterfoil' is the definition.
(I know that counterfoil can be written as stub)
This is all the clue.
(Other definitions for stub that I've seen before include "Objections after picking up" , "Strike against hard object - one's toe, perhaps" , "Pencil or cigarette end" , "Short bit of pencil, say" , "30 [FAG END]" .)