Crossword Genius

Prisoner's fast run in Greek hunt is fantastic (6,6)

Ross

I believe the answer is:

hunger strike

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'prisoner's fast' is the definition.
(fast taken by a prisoner)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for hunger strike that I've seen before include "Non-violent protest" , "fast" , "Starvation protest" .)

I've seen this clue in The Telegraph.
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