Callow (13)
I believe the answer is:
inexperienced
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">callow</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for inexperienced that I've seen before include "Green; lacking skill" , "unqualified" , "Green, naive" , "Callow" , "Raw, unskilled" .)