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All answers having "Fruit tree" as clue:

3 Character Answers:

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ELB

FIG



4 Character Answers:

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LIME

PEAR

PLUM

SLOE

SORB



5 Character Answers:

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APPLE

LEMON

OLIVE

PAPAW

PEACH



6 Character Answers:

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MEDLAR



8 Character Answers:

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DATEPALM