Slapstick comedy prop (6,4)
(Other definitions for banana skin that I've seen before include "Something unforeseen that may cause a slip-up" , "Potential disaster" , "something to cause embarrassment" , "Potential downfall" , "potential hazard" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">slapstick comedy prop</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 custard pie that I've seen before include "Item thrown in slapstick comedy" , "But is one thrown" , "Slapstick missile" , "Clown's dessert?" , "What featured in comedy" .)