An element used in painting? (6)
I believe the answer is:
iodine
This could be a double definition.
'an element' is the first definition.
(I know that iodine is a type of nonmetal)
'painting?' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'used in' is the link.
Can you help me to learn more?
(Other definitions for iodine that I've seen before include "Element, atomic number 53" , "Element used in medicine, photography and dyes" , "Black/violet element" , "Black crystalline element" , "Disinfectant made from seaweed" .)