Slapstick item spoiling sad picture? (7,3)
I believe the answer is:
custard pie
'slapstick item' is the definition.
The definition suggests a singular noun which matches the answer.
'spoiling sad picture?' is the wordplay.
'spoiling' is an anagram indicator.
'sad'+'picture'='sadpicture'
'sadpicture' with letters rearranged gives 'CUSTARD-PIE'.
Can you help me to learn more?
(Other definitions for custard pie that I've seen before include "But is one thrown" , "What featured in comedy" , "Element of slapstick" , "Clown's dessert?" , "Item thrown in slapstick comedy" .)