Extra lean? (5)
I believe the answer is:
spare
I believe this clue is a double definition.
'extra' is the first definition.
(both can mean left over)
'lean?' is the second definition.
('spare' can be similar in meaning to 'lean')
(Other definitions for spare that I've seen before include "Surplus to requirements" , "This tyre around the middle is fat" , "A feature of trousers" , "Excess to requirements" , "Extra item just in case" .)