Useless; conceited (4)
I believe the answer is:
vain
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">useless</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">conceited</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for vain that I've seen before include "Useless; conceited" , "Forever looking in the mirror" , "Conceited - futile" , "Stuck-up? It's hopeless" , "It's no good" .)