Python broke rat's kneecap (6,5)

I believe the answer is:

carpet snake

'python' is the definition.
(carpet snake is a kind of python)

'broke rat's kneecap' is the wordplay.
'broke' indicates an anagram.
'rats'+'kneecap'='ratskneecap'
'ratskneecap' with letters rearranged gives 'CARPET-SNAKE'.

(Another definition for carpet snake that I've seen is " reptile".)

I've seen this clue in The Mirror.

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