Diamond club (3)
I believe the answer is:
bat
'diamond club' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bat that I've seen before include "Pipistrelle" , "Nocturnal animal - racket" , "Flutter (eyelids)" , "Wooden implement for cricket" , "The cricketer wields it" .)