Crossword Genius

Their tops form a forest canopy (5)

Ross

I believe the answer is:

trees

(Other definitions for trees that I've seen before include "''I see ... of green / Red roses too'' (What a Wonderful World)" , "Large plants" , "Long lock of hair" , "Elders perhaps" , "Tall, perennial, woody plant" .)

I've seen this clue in The Washington Post.
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