Crossword Genius

... must have made joint attack to depose king (4)

Ross

I believe the answer is:

need

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'must have' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for need that I've seen before include "destitute state" , "Lack - demand" , "Rely on" , "state requiring relief" , "Require (as essential)" .)

I've seen this clue in The Independent.
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