Arch support
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">arch support</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for insole that I've seen before include "Padding in a shoe" , "Part of a shoe or boot" , "support for rambler, perhaps" , "Lesion in part of foot" , "Inner part of shoe" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">arch support</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for keystone that I've seen before include "Important piece at apex of arch" , "Central part of arch" , "Something on which all else depends" , "Central principle of a policy" , "Central block at the top of an arch" .)