Taxi cut the old knight up with attitude (7,8)

I believe the answer is:

hackney-carriage

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

'taxi' is the definition.
(I've seen this before)

'cut the old knight up with attitude' is the wordplay.
I cannot really understand how this works, but
'cut' could be 'hack' (hacking is a kind of cutting) and 'hack' is located in the answer.
'knight' could be 'n' (chess abbreviation) and 'n' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Telegraph.

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