He painted large bat on house (7)
I believe the answer is:
holbein
'he painted' is the definition.
(Hans Holbein the Younger or Hans Holbein the Elder)
'large bat on house' is the wordplay.
'large' becomes 'L' (eg in clothes sizes).
'bat' becomes 'be in' (to bat is to be 'in' in cricket).
'on' says to put letters next to each other.
'house' becomes 'ho' (abbreviation for house).
'l'+'bein'='lbein'
'lbein' put after 'ho' is 'HOLBEIN'.
(Other definitions for holbein that I've seen before include "Hans ---, painted Erasmus, More" , "Hans -, court painter to Henry VIII" , "German painter at the court of Henry VIII" , "Hans -, German artist who painted Henry VIII" , "Hans --, one of two related German painter" .)