Infirm (8)
I believe the answer is:
decrepit
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">infirm</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that infirm can be written as decrepit)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for decrepit that I've seen before include "Run-down by old age or hard use" , "Pet cried (anag) - worn out" , "rickety" , "Dilapidated, made weak by age" , "Depicter in state of dilapidation" .)