Crossword Genius

It's growing dapper (6)

Ross

I believe the answer is:

spruce

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'dapper' is the definition.
(synonyms)

I cannot understand how the rest of the clue works.

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(Other definitions for spruce that I've seen before include "Smart, trim" , "perfect condition" , "Tidy - fir" , "wood" , "One [TYPE OF TREE]" .)

I've seen this clue in the Evening Standard.
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