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All answers having "Type of tree" as clue:

3 Character Answers:

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ELM

YEW



4 Character Answers:

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GLUE

PALM

PINE



5 Character Answers:

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ALDER

BIRCH

DELAY

MAPLE



6 Character Answers:

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AIMFOR



7 Character Answers:

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CONIFER

CRUISER



13 Character Answers:

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HORSECHESTNUT