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All answers having "Spruce" as clue:

3 Character Answers:

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FIR



4 Character Answers:

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NEAT

PINE

TIDY

TREE

TRIG

TRIM



5 Character Answers:

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NATTY

PRIMP

SMART



6 Character Answers:

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DAPPER

SPIFFY



7 Character Answers:

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CONIFER

SMARTEN



10 Character Answers:

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NEATASAPIN