Criticise the registered feline (7)
I believe the answer is:
panther
'feline' is the definition.
(I know that Panther is a house cat)
'criticise the registered' is the wordplay.
'criticise' becomes 'pan' (informal term meaning to criticise heavily).
'registered' becomes 'R' (abbreviation, as in registered trademark).
'pan'+'the'+'r'='PANTHER'
(Other definitions for panther that I've seen before include "Black leopard" , "kind of feline" , "big pussycat" , "Big cat" , "Then rap the large black cat" .)