Do without extra small prune left over (5)
I believe the answer is:
spare
I believe this clue is a quintuple definition!!
'do without' is the first definition.
(I've seen this in another clue)
'extra' is the second definition.
(both can mean left over)
'small' is the third definition.
(thesaurus)
'prune left' is the fourth definition.
'spare' can be an answer for 'left' (thesaurus). I am not certain of the 'prune' bit.
'over' is the fifth definition.
(I've seen this before)
(Other definitions for spare that I've seen before include "Thin; left over" , "show mercy" , "Free" , "This tyre around the middle is fat" , "not in actual use" .)