Lab containers (5)
I believe the answer is:
vials
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lab containers</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for vials that I've seen before include "Small bottles of medicine" , "Vessels" , "Ampoules" , "Small bottle that contains a drug" , "Small glass containers" .)