Want very much to know about the source of the food (7)
I believe the answer is:
'source of the food' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'want very much to know about' is the wordplay.
'want very much' becomes 'itch' (I can't explain this - if you can you should give a lot more credence to this answer).
'to know' becomes 'ken' (I've seen this in another clue).
'about' indicates putting letters inside.
'itch' going within 'ken' is 'KITCHEN'.
'the' is the link.
Can you help me to learn more?
(Other definitions for kitchen that I've seen before include "Room with cooking facilities" , "Room - thicken (anag)" , "Area for preparing meals" , "Room for food" , "In workplace" .)