Evaluate, analyse (5)
I believe the answer is:
assay
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">evaluate</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">analyse</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(assaying is a kind of analysing)</span><br/ ><br/ ></span>
(Other definitions for assay that I've seen before include "Test quality of metals" , "'Analyse, precious metal, say (5)'" , "metallurgical test" , "Test ore for content" , "Test gold" .)