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All answers having "Narcotic" as clue:

3 Character Answers:

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DOE

END

ERA



4 Character Answers:

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DRUG

VISA



5 Character Answers:

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OPIUM



6 Character Answers:

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HEROIN

OPIATE

STANCE



7 Character Answers:

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COCAINE

HASHISH



9 Character Answers:

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NARCISSUS



13 Character Answers:

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INSOMANYWORDS