Scientist's room (3)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">scientist's room</span>' is the definition.<br/ ><span class="explanation-format__explanation">(laboratory)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for lab that I've seen before include "Socialist" , "Room for scientist" , "Chemist's workroom" , "biology classroom?" , "Dog" .)
(Other definitions for laboratory that I've seen before include "Where one investigates" , "Place of scientific research" , "Experimental area" , "Place for experimentation" , "Language-learning facility" .)