Wasteful, incompetent (11)
I believe the answer is:
inefficient
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">wasteful</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >'<span class="explanation-format__original">incompetent</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(associated in meaning)</span><br/ ><br/ ></span>
(Other definitions for inefficient that I've seen before include "lacking competence" , "Failing to make the best use of time or resources" , "Achieving low productivity" , "Not achieving maximum productivity" .)