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All answers having "Hot stuff" as clue:

3 Character Answers:

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IRE



4 Character Answers:

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FIRE

LAVA

LOOT

RAGE



5 Character Answers:

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ANGER

CHILI

COALS

MAGMA

SALSA

STEAM



6 Character Answers:

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CHILES

CHILLI

TAMALE

WASABI



7 Character Answers:

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ALLTHAT

CAYENNE

CHILIES

EROTICA

TABASCO

TAMALES



8 Character Answers:

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GODSGIFT

SRIRACHA



10 Character Answers:

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CHILISAUCE

HITRECORDS

MOLTENLAVA

STOLENCARS



11 Character Answers:

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CURRYPOWDER

FALARMCHILI

STOLENGOODS



12 Character Answers:

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TABASCOSAUCE