Left over (5)
'left over' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for extra that I've seen before include "Actor's part" , "unused" , "special edition of the paper" , "more than is necessary" , "Surcharge" .)
'left over' is the definition.
(going spare)
This is the entire clue.
(Other definitions for spare that I've seen before include "This tyre around the middle is fat" , "Refrain from using" , "Don't use" , "show mercy" , "Not required" .)
'left over' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for unused that I've seen before include "Not accustomed to" , "Neither employed nor second-hand" , "hadn't been exploited" , "factory fresh" , "Extra" .)
'left over' is the definition.
(I've seen this before)
This is all the clue.
(Another definition for to spare that I've seen is " Left over".)