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All answers having "Burn" as clue:

3 Character Answers:

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DIS

TAN



4 Character Answers:

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CHAR

SEAR

SLOW



5 Character Answers:

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CENSE

SCALD

SINGE

SMART

USEUP



6 Character Answers:

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FLAMBE

OVERDO

SCATHE

SCORCH

SEETHE



7 Character Answers:

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COMBUST

CREMATE



9 Character Answers:

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CAUTERIZE



10 Character Answers:

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INCINERATE