Heralds coat, thanks to the artist (6)
I believe the answer is:
tabard
'heralds coat' is the definition.
'tabard' can be an answer for 'coat' (I've seen this before). I am not sure about the 'heralds' bit.
'thanks to the artist' is the wordplay.
'thanks' becomes 'ta' (UK informal version of 'thank you').
'to the artist' becomes 'bard' (I can't justify this - if you can you should believe this answer much more).
'ta'+'bard'='TABARD'
Can you help me to learn more?
(Other definitions for tabard that I've seen before include "Coat worn by herald" , "Knight's outer tunic" , "[A] top" , "Herald's coat or tunic" , "Sleeveless jacket" .)