Last worker, sweet (7)
I believe the answer is:
cobbler
This could be a double definition.
'last worker' is the first definition.
(a last is a tool used by a cobbler)
'sweet' is the second definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Maybe they are linked in a way I don't understand?
Can you help me to learn more?
(Other definitions for cobbler that I've seen before include "One might fix heels" , "Iced drink - fruit pie with a crunchy topping" , "Shoe repairer" , "Man at last" , "Clobber for shoemaker" .)