Theatrical Lionel gets work with lead perhaps (6)
I believe the answer is:
niello
'theatrical' is the definition.
Both the answer and definition are singular nouns.
Perhaps there's a link between them I don't understand?
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for niello that I've seen before include "Method of engraving" , "Style of ornamenting metal, lo line (anag.)" , "Black filling for engravings on metal; lo line (anag.)" .)