Joint ailment (4)
I believe the answer is:
gout
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">joint ailment</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for gout that I've seen before include "Painful ailment, often of the foot" , "Inflammatory disease" , "Toe-swelling disease" , "Disease caused by excess uric acid in the bloodstream" , "Painful (joint) ailment" .)