Extra spear was ordered (5)
I believe the answer is:
spare
'extra' is the definition.
(both can mean left over)
'spear was ordered' is the wordplay.
'spear' can be anagrammed to 'SPARE'.
But, I'm not clear how the anagram is indicated.
Can you help me to learn more?
(Other definitions for spare that I've seen before include "Extra item just in case" , "Excess to requirements" , "Thin; elegantly simple" , "Don't use" , "Let off; extra" .)