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All answers having "Call forth" as clue:

3 Character Answers:

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ASS



5 Character Answers:

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EVOKE

ROUSE



6 Character Answers:

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AROUSE

AWAKEN

BECKON

ELICIT

EVINCE

INVOKE

MUSTER

SUMMON



7 Character Answers:

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EVOCATE



8 Character Answers:

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EPIDEMIC