Clubs will make you mad! (4)
I believe the answer is:
bats
I believe this clue is a double definition.
'clubs' is the first definition.
(bat is a kind of club)
'mad' is the second definition.
(informal term for mad)
'will make you' acts as a link.
(Other definitions for bats that I've seen before include "Mad - nocturnal creatures" , "bananas" , "Very eccentric" , "Cuckoo" , "cracked" .)