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All answers having "Consumes" as clue:

3 Character Answers:

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HAS



4 Character Answers:

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EATS

USES



6 Character Answers:

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EATSOF

EATSUP

SPENDS

USESUP



7 Character Answers:

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ANDIRON

CHERISH

FEEDSON

INGESTS

TAKESUP



12 Character Answers:

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ELECTROLYSIS