Ungovernable (7)
(Other definitions for wayward that I've seen before include "Stubborn" , "Childishly self-willed, unruly" , "Capricious and undisciplined" , "Resistant to discipline" , "Undisciplined, headstrong" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ungovernable</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for insubordinate that I've seen before include "Cheeky" , "Disobedient" , "undisciplined" , "Rebellious" , "Defiant of authority" .)