Conventionally used cooking ingredient (5)
I believe the answer is:
stock
This clue could be a double definition.
'conventionally used cooking' is the first definition.
The definition and answer can be both things that one consumes for nourishment as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'ingredient' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
Can you help me to learn more?
(Other definitions for stock that I've seen before include "Bouillon" , "Consomm-like liquid" , "F < for traditional" , "Cravat worn as part of ridingkit" , "Supply; plant" .)