Tomfoolery (6)
'tomfoolery' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for antics that I've seen before include "comical capers" , "Tomfoolery" , "Absurd or foolish movements intended to amuse" , "extraordinary goings-on" , "Absurd tricks or pranks" .)
'tomfoolery' is the definition.
(I know that tomfoolery can be written as craziness)
This is the entire clue.
(Other definitions for craziness that I've seen before include "Tomfoolery, flakiness" , "Madness" .)