Crossword Genius

Tree described as quaking or trembling (5)

Ross

I believe the answer is:

aspen

(Other definitions for aspen that I've seen before include "Type of poplar" , "Trembler" , "Tree that quivers" , "Trembling poplar tree" , "Tree with shivering leaves" .)

I've seen this clue in The Sunday Times and The Times.
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