Crossword Genius

Troublesome (as reef or sheepshank?) (6)

Ross

I believe the answer is:

knotty

(Other definitions for knotty that I've seen before include "Extremely difficult" , "Awkward" , "Difficult (like wood hard to chop through?)" , "Difficult - intricate" , "puzzling" .)

I've seen this clue in The Guardian.
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