Slapstick comedy prop (7,3)
(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" .)
'slapstick comedy prop' is the definition.
(I've seen this in another clue)
This is the entire clue.
(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" .)