Snooty arse sanctimonious about "end of art" (9)
I believe the answer is:
bumptious
'snooty arse sanctimonious about end of art' is the definition.
I can't tell whether this defines the answer.
'snooty arse sanctimonious about end of art' is the wordplay.
'snooty arse' becomes 'bum' (synonyms. I am not sure about the 'snooty' bit.).
'sanctimonious' becomes 'pious' (similar in meaning).
'about' indicates putting letters inside.
'end of' says to take the final letters.
The final letter of 'art' is 't'.
'pious' enclosing 't' is 'ptious'.
'bum'+'ptious'='BUMPTIOUS'
Can you help me to learn more?
(Other definitions for bumptious that I've seen before include "Irritatingly self-assertive" , "pushy?" , "Offensively self-assertive" , "self-important" .)