Concentration (9)
I believe the answer is:
attention
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">concentration</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for attention that I've seen before include "Concentration, heed" , "order to stand still" , "careful thought" , "notice" , "Applying the mind, mental concentration" .)