Extra pears are ordered (5)
I believe the answer is:
spare
'extra' is the definition.
(both can mean left over)
'pears are ordered' is the wordplay.
'are ordered' is an anagram indicator.
'pears' anagrammed gives 'SPARE'.
(Other definitions for spare that I've seen before include "This tyre around the middle is fat" , "A feature of trousers" , "show mercy" , "Pardon; unneeded" , "Not required" .)