Appraise or gauge (8)
I believe the answer is:
evaluate
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">appraise</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that appraise can be written as evaluate)</span><br/ ><br/ >'<span class="explanation-format__original">gauge</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for evaluate that I've seen before include "Make an assessment of, determine worth" , "Reckon worth of" , "'Assess, appraise (8)'" , "Judge the worth of something" , "Make an assessment of, measure" .)