Has it a singular need for butter? (7)
I believe the answer is:
parsnip
'butter?' is the definition.
The definition and answer can be both things that one consumes for nourishment as well as being singular nouns.
Maybe there's an association between them I don't understand?
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for parsnip that I've seen before include "Tapering vegetable" , "Spar pin (anag) - vegetable" , "Pale carrot-like vegetable" , "Yellow root vegetable" , "Type of root veg" .)