Device for measuring out spirits (5)
I believe the answer is:
optic
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">device for measuring out spirits</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for optic that I've seen before include "Spirit measuring device" , "Relating to the eyes" , "Relating to vision" , "Device for measuring dispensed alcohol" , "Spirits measurer" .)