Standards or principles on which to base a judgement (8)
I believe the answer is:
criteria
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">standards</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know this)</span><br/ ><br/ >'<span class="explanation-format__original">principles on which to base a judgement</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for criteria that I've seen before include "'Standards, reference points (8)'" , "Standards by which judgement can be made" , "Benchmarks" , "Ideals" , "Principles for decision" .)