Louisville Slugger (3)
I believe the answer is:
bat
'louisville slugger' 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 "A mammal; a club" , "Small winged mammal, may be vampire" , "Creature" , "Night-flyer" , "Cricket, table-tennis and baseball implement" .)