Area of hard skin (6)
I believe the answer is:
callus
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">area of hard skin</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 callus that I've seen before include "Area of hard skin" , "A sore point" , "Skin problem" , "Corn" , "This thick-skinned" .)