Crossword Genius

Owners of smart rabbit warren tidied up burrows regularly (also half a dozen others here) (6,4)

Ross

I believe the answer is:

warner bros

I'm a little stuck... Click here to teach me more about this clue!

'owners of smart rabbit' is the definition.
(studio which created Bugs Bunny)

'warren tidied up burrows regularly also half a dozen others here' is the wordplay.
I cannot really see how this works, but
an anagram of 'warren' is 'warner' which is present in the answer.
The remaining letters 'bros' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for warner bros that I've seen is " record label".)

I've seen this clue in The Guardian.
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