Crossword Genius

Conspirator who made rent bills up (at least three) (5)

Ross

I believe the answer is:

casca

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

I can't explain the rest of the clue.

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(Other definitions for casca that I've seen before include "Stabbed by him, Caesar" , "envious assassin" , "plotter against Caesar" , "Roman conspirator" , "Conspirator responsible for rent" .)

I've seen this clue in The Times.
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