It involves throwing things on a wheel (7)
I believe the answer is:
pottery
This clue might be a double definition.
'it involves throwing things' is the first definition.
The definition suggests a singular noun which matches the answer.
'wheel' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'on a' acts as a link.
Can you help me to learn more?
(Other definitions for pottery that I've seen before include "Ceramic ware" , "Goods of fired clay" , "Clayware" , "China, for example" , "Items of fired clay" .)