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All answers having "Worker ___" as clue:

3 Character Answers:

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ANT



4 Character Answers:

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AIDE

DOER

HAND

PEON



5 Character Answers:

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DRONE

PLIER



6 Character Answers:

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EARNER

SOCIAL

TOILER



7 Character Answers:

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LABORER

MIGRANT



8 Character Answers:

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EMPLOYEE

LABOURER

OPERATOR



9 Character Answers:

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OPERATIVE