Crossword Genius

Big obstacles at a golf course (5)

Ross

I believe the answer is:

trees

(Other definitions for trees that I've seen before include "Large plants" , "Long lock of hair" , "Ashes, perhaps?" , "Elms, pines etc" , "''I see ... of green / Red roses too'' (What a Wonderful World)" .)

I've seen this clue in The New York Times.
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