Inner surface of the hand (4)
I believe the answer is:
palm
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">inner surface of the hand</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for palm that I've seen before include "Tropical tree with large leaves" , "Tropical tree; conceal" , "Secretly snatch" , "Coconut-bearing tree" , ""trophy"" .)