Slapstick comedy item (7,3)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
custard pie
(Other definitions for custard pie that I've seen before include "It's thrown for laughs" , "What featured in comedy" , "Item thrown in slapstick comedy" , "Slapstick missile" , "But is one thrown" .)