Crossword Genius

Tidy growth in forestry (6)

Ross

I believe the answer is:

spruce

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'tidy' is the definition.
(similar in meaning)

I can't explain the remainder of the clue.

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(Other definitions for spruce that I've seen before include "thing for fairy to be on top of?" , "wood" , "Smart, trim" , "Coniferous tree" , "Neat - evergreen" .)

I've seen this clue in The Telegraph.
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