Misery ending in poker with kings in hand (6)

I believe the answer is:

worker

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

(Other definitions for worker that I've seen before include "See 1" , "Labourer" , "See 8" , "Type of bee" , "See 20" .)

I've seen this clue in The Guardian and The Sun.

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