Cooked pears left over (5)
I believe the answer is:
spare
'left over' is the definition.
(going spare)
'cooked pears' is the wordplay.
'cooked' indicates an anagram (letters cooked into a new form).
'pears' anagrammed gives 'SPARE'.
(Other definitions for spare that I've seen before include "Free" , "This tyre is for emergencies" , "Surplus to requirements" , "With no excess fat" , "In reserve; pardon" .)