Test site (3)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">test site</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for lab that I've seen before include "Socialist" , "Science room" , "Scientist's workroom" , "biology classroom?" , "Place for experiments" .)
(Other definitions for class that I've seen before include "Category; form" , "People having the same social or economic status" , "Genus" , "School group" , "sort" .)