Painter of cat catching ball at home (7)
I believe the answer is:
poussin
'painter' is the definition.
(I have seen 'French painter' mean 'poussin' so perhaps 'painter' could also mean 'poussin')
'cat catching ball at home' is the wordplay.
'cat' becomes 'puss' (puss is a kind of cat).
'catching' indicates putting letters inside.
'ball' becomes 'o'.
'at home' becomes 'in' ('in' can be similar in meaning to 'at home').
'puss' enclosing 'o' is 'pouss'.
'pouss'+'in'='POUSSIN'
'of' is the link.
(Other definitions for poussin that I've seen before include "Young chicken for eating - French painter, d. 1665" , "Artist" , "Small chicken; painter" , "young bird" , "He painted" .)