Renegade property lord removed walls (7)

I believe the answer is:

traitor

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

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

I cannot understand how the rest of the clue works.

(Other definitions for traitor that I've seen before include "Someone guilty of treason" , "Not a good subject" , "Turncoat" , "Person betraying a cause" , "Renegade" .)

I've seen this clue in the Sydney Morning Herald.

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