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All answers having "Squash" as clue:

3 Character Answers:

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END

NIX



4 Character Answers:

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MASH

PEPO



5 Character Answers:

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ACORN

GOURD

LEMON

LIEON

PEPOS

SITON

SPORT

STOMP



6 Character Answers:

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STEPON



7 Character Answers:

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FLATTEN

SQUEEZE

STOMPON



8 Character Answers:

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ZUCCHINI



9 Character Answers:

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VEGETABLE



12 Character Answers:

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CRUSHTOAPULP



15 Character Answers:

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ACTLIKEGODZILLA



17 Character Answers:

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RACKETANDBALLGAME