The rubbing of one object against another (8)
I believe the answer is:
friction
'the rubbing of one object against another' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for friction that I've seen before include "animosity" , "Disagreement" , "Conflict between people who rub each other the wrong way" , "Sliding resistance" , "bad blood" .)