Pie part (5)
I believe the answer is:
crust
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">pie part</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 crust that I've seen before include "Pie topping" , "Hardened layer; pie top" , "Hard knowledge" , "Pie covering" , "Hard outer layer" .)