Prickly (6)
I believe the answer is:
thorny
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">prickly</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for thorny that I've seen before include "Problematic (question)" , "Tricky" , "Causing difficulty - like a bed of roses?" , "Unpleasant" , "Trying" .)