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All answers having "Lighter?" as clue:

3 Character Answers:

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RHO

SUN



4 Character Answers:

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LAMP

SCOW



5 Character Answers:

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BARGE

MATCH

PALER



6 Character Answers:

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AIRIER

EASIER



7 Character Answers:

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CLEARER

IGNITER



8 Character Answers:

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ARSONIST