Scurvy cardsharp... (8)

I believe the answer is:

blackleg

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But I can't explain it at all! Could you help me understand?

(Other definitions for blackleg that I've seen before include "Person who works while others are on strike, having dark limb" , "Scab, strikebreaker" , "Strikebreaker - disease of farm animals" , "One who breaks a strike by working" , "one not out, controversially" .)

I've seen this clue in The Hindu.

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