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All answers having "Instruct" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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SHOW



5 Character Answers:

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EDIFY

ENLEN

ORDER

TEACH

TRAIN

TUTOR



6 Character Answers:

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SCHOOL



7 Character Answers:

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EDUCATE



9 Character Answers:

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PERPETUAL



15 Character Answers:

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SHOWONETHEROPES