Damage from ordinary use (4,3,4)
I believe the answer is:
wear and tear
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">damage from ordinary use</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(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" .)