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All answers having "Office worker" as clue:

5 Character Answers:

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CLERK

FILER

STENO

TYPER



6 Character Answers:

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TYPIST



7 Character Answers:

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STAFFER



9 Character Answers:

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SECRETARY



12 Character Answers:

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PENCILPUSHER



15 Character Answers:

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ACCOUNTINGCLERK