Conceal in the hand (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">conceal in the hand</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 palm that I've seen before include "Use hand" , "Conceal magician" , "Date-tree" , "Underside of hand" , ""trophy"" .)