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All answers having "Detective" as clue:

4 Character Answers:

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DICK

TAIL



5 Character Answers:

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AGENT

SNOOP



6 Character Answers:

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FINDER

SHAMUS

SLEUTH

TRACER



7 Character Answers:

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GLEANER

SPOTTER

TRACKER



8 Character Answers:

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HAWKSHAW

POIROTAC

REASONER



9 Character Answers:

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OPERATIVE



10 Character Answers:

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PRIVATEEYE



15 Character Answers:

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PLAINCLOTHESMAN