Standard score (3)
I believe the answer is:
par
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">standard score</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 par that I've seen before include "Normal golfing score" , "Norm" , "Rap for being average" , "Average standard" , "Average score for round of golf" .)