Volunteers to punch stupidly entitled art-fan (10)
I believe the answer is:
dilettante
'fan' is the definition.
(thesaurus)
'volunteers to punch stupidly entitled' is the wordplay.
'volunteers' becomes 'TA' (abbreviation for Territorial Army).
'to punch' indicates putting letters inside (some letters punch a hole in others).
'stupidly' is an anagram indicator (a stupid ordering of the letters).
'entitled' is an anagram of 'diletnte'.
'ta' going within 'diletnte' is 'DILETTANTE'.
'art' is the link.
I am not very happy about this link. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for dilettante that I've seen before include "One with superficial knowledge" , "Amateurish" , "Arty type" , "whose study is superficial?" , "amateur artist" .)