Violation of accepted behaviour about return for art (13)
I believe the answer is:
contravention
'violation' is the definition.
(thesaurus)
'of accepted behaviour about return for art' is the wordplay.
I cannot quite see how this works, but
'of' could be 'o' and 'o' is found in the answer.
'accepted' could be 'a' (financial abbreviation) and 'a' is found within the answer.
'about' could be 'on' (as in a book 'on' a certain topic) and 'on' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for contravention that I've seen before include "breach of regulations" , "Infringement (of a law)" .)