Crazy clubs (4)
I believe the answer is:
bats
I believe this clue is a double definition.
'crazy' is the first definition.
(I've seen this before)
'clubs' is the second definition.
(bat is a kind of club)
(Other definitions for bats that I've seen before include "Mad - clubs" , "Hutton and Gilligan" , "Loopy; mammals" , "Bonkers (sl.)" , "Lunatic" .)