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All answers having "Working" as clue:

4 Character Answers:

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ATIT



5 Character Answers:

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GOING

INUSE

STIFF



6 Character Answers:

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ACTIVE

ONDUTY

UNIDLE

USABLE



7 Character Answers:

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ONACASE

OPERANT



8 Character Answers:

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DRIVABLE

EMPLOYED

KNEADING

ONPATROL

ONTHEJOB



9 Character Answers:

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OPERATING

OPERATIVE



10 Character Answers:

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FUNCTIONAL



11 Character Answers:

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OPERATIONAL



15 Character Answers:

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PLYINGONESTRADE