Achy (4)
I believe the answer is:
sore
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">achy</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 sore that I've seen before include "Painful, or the source of pain" , "Hard" , "See 16" , "To be very old" , "Tender spot" .)