Lacking professional expertise (7)
I believe the answer is:
amateur
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lacking professional expertise</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for amateur that I've seen before include "lacking professionalism" , "Person who does something as a pastime rather than a profession" , "Dilettante: buff" , "lacking professional expertise" , "he won't get paid" .)