Knight club (4)
I believe the answer is:
mace
'knight club' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for mace that I've seen before include "Staff - ground nutmeg" , "Ceremonial staff or kind of spice" , "Came to get ceremonial staff" , "Disabling spray" , "Staff of office for a flavouring" .)