Bit of buffoonery (5)
I believe the answer is:
'bit of buffoonery' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for antic that I've seen before include "Tomfoolery" , "Playful caper" , "Caper; grotesque (arch.)" , "Eccentric once" , "Caper, trick" .)