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All answers having "Heavy metal?" as clue:

3 Character Answers:

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ORE



4 Character Answers:

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GOWN

IRON

LEAD

LOAN

LOCH



5 Character Answers:

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CRAFT

LANCE

STEEL



6 Character Answers:

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GREASE

NORMAL

OSMIUM



7 Character Answers:

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URANIUM



8 Character Answers:

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INCLINED

SINECURE



11 Character Answers:

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WARMHEARTED