Amount to be divided (3)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">amount to be divided</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for pie that I've seen before include "In the sky, it's a hopeless idea" , "A baked dish covered with pastry" , "steak might go in this" , "Fruit or meat dish" , "something with custard, say" .)