Strikebreaker's revolutionary payment method (4)

I believe the answer is:

scab

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'strikebreaker's' is the definition.
(synonyms)

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

(Other definitions for scab that I've seen before include "Ignorer of strike" , "Derogatory term for a strike-breaker" , "Someone who works during a strike" , "Wound's crust" , "He's not out" .)

I've seen this clue in The Sun.

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