Extra spear was thrown (5)

I believe the answer is:

spare

'extra' is the definition.
(both can mean left over)

'spear was thrown' is the wordplay.
'was thrown' indicates an anagram.
'spear' anagrammed gives 'SPARE'.

(Other definitions for spare that I've seen before include "not in actual use" , "show mercy" , "This tyre around the middle is fat" , "Thin; surplus" , "Leftover" .)

I've seen this clue in The Mirror.

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