Extra strawberries finally cut (5)
I believe the answer is:
spare
'extra' is the definition.
(both can mean left over)
'strawberries finally cut' is the wordplay.
'finally' says to take the final letters.
'cut' becomes 'pare' (paring is a kind of cutting).
The last letter of 'strawberries' is 's'.
's'+'pare'='SPARE'
(Other definitions for spare that I've seen before include "With no excess fat" , "show mercy" , "In reserve; pardon" , "Extra; lean" , "Not required" .)