Defensive spray (4)
I believe the answer is:
mace
'defensive spray' 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 "Came to get nutmeg spice" , "Came to get ancient weapon" , "Came to find ceremonial staff" , "Ceremonial staff of office" , "Came to get ceremonial staff" .)