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All answers having "Hot spots" as clue:

3 Character Answers:

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HHS

RHO



4 Character Answers:

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SPAS

TEAS



5 Character Answers:

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KILNS

OASTS

OPENS

OVENS

PYRES



6 Character Answers:

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RANGES

SAUNAS

STOVES



7 Character Answers:

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DESERTS

HEARTHS



8 Character Answers:

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INFERNOS



12 Character Answers:

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LEOPARDPRINT