Damage from ordinary use (4,3,4)
I believe the answer is:
wear and tear
'damage from ordinary use' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for wear and tear that I've seen before include "Natural deterioration" , "Damage from ordinary use" , "Gradual damage" , "Deterioration in normal use" , "General damage from normal use" .)