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All answers having "Fire up" as clue:

3 Character Answers:

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AMP

FLA

REV

RHO



4 Character Answers:

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FUEL

GOAD

HEAT

RILE



5 Character Answers:

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ANGER

LIGHT

ROUSE

START

STOKE



6 Character Answers:

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AROUSE

ENRAGE

EXCITE

FOMENT

IGNITE

INCITE

SPURON

URGEON



7 Character Answers:

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ENTHUSE

INSPIRE