Challenge authority (5)
I believe the answer is:
rebel
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">challenge authority</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for rebel that I've seen before include "Insurrectionist" , "Insurgent, mutineer" , "Flouter of authority" , "Insurgent, renegade" , "Non-conformist" .)