All the things one wants to buy (8,4)
I believe the answer is:
shopping list
'buy' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see a link between them that I can't see?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for shopping list that I've seen before include "Required items" , "grass may have?" , "agenda" .)