Ordered spare weapon (5)
I believe the answer is:
spear
'weapon' is the definition.
(I know that spear is a type of weapon)
'ordered spare' is the wordplay.
'ordered' indicates an anagram.
'spare' anagrammed gives 'SPEAR'.
(Other definitions for spear that I've seen before include "A bit of asparagus" , "Thrown weapon" , "Lance" , "stick" , "Portion of asparagus" .)