You'll find me in the lane coming back for top coat (6)
I believe the answer is:
enamel
'coat' is the definition.
(I know that enamel is a type of coat)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for enamel that I've seen before include "hard cover" , "Hard type of paint" , "Decorative or protective covering on metal or glass." , "protective coat" , "Decorative inlay" .)