Painter of a house? Nonsense! (5)
I believe the answer is:
corot
'painter' is the definition.
(I know that Corot is a painter)
'a house? nonsense' is the wordplay.
'a house?' becomes 'co' (I can't explain this - if you can you should give a lot more credence to this answer).
'nonsense' becomes 'rot' (rot can mean nonsense or rubbish).
'co'+'rot'='COROT'
'of' is the link.
Can you help me to learn more?
(Other definitions for corot that I've seen before include "French landscape painter, 1796-1875" , "Fr. landscape artist, d. 1875" , "French landscape painter, d. 1875" , "19th century French painter" , "Barbizon School artist" .)