Highest point of excellence (4)
I believe the answer is:
acme
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">highest point of excellence</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 acme that I've seen before include "Culmination" , "highest position" , "Highest point (of something)" , "Came awkwardly to the highest point" , "crisis in history" .)