Criticise the registered cat (7)

I believe the answer is:

panther

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'cat' is the definition.
(panther is a kind of cat)

'criticise the registered' is the wordplay.
'criticise' becomes 'pan' (informal term meaning to criticise heavily).
'registered' becomes 'r' (this might be a standard abbreviation of which I'm unaware).
'pan'+'the'+'r'='PANTHER'

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(Other definitions for panther that I've seen before include "big pussycat" , "See 2" , "Big cat" , "Then rap the large black cat" , "animal!" .)

I've seen this clue in The Mirror.

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