Crossword Genius

Poplar tree (5)

Ross

I believe the answer is:

aspen

'poplar tree' is the definition.
(aspen is a kind of poplar tree)

This is all the clue.

(Other definitions for aspen that I've seen before include "One trembling" , "Very timid" , "Tree, kind of poplar" , "somewhere in Colorado" , "that's wooden" .)

I've seen this clue in the Penny Press, The Guardian, The Mirror and The Times.
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