Difficult, intricate (6)
I believe the answer is:
knotty
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">difficult</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >'<span class="explanation-format__original">intricate</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for knotty that I've seen before include "Gnarled - complicated" , "Pinewood can be" , "Difficult (like wood hard to chop through?)" , "Difficult (point)" , "Describing a difficult problem" .)