Fool starts with any silly schtick (3)
I believe the answer is:
ass
'fool' is the definition.
(both can mean a stupid person)
'starts with any silly schtick' is the wordplay.
'starts with' suggests taking the first letters.
The first letters of 'any silly schtick' is 'ASS'.
(Other definitions for ass that I've seen before include "Dolt" , "Blockhead" , "Charlie" , "mug" , "oaf" .)