Work, operate (8)
I believe the answer is:
function
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">work</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">operate</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for function that I've seen before include "Operate" , "Special purpose or social affair" , "An official ceremony" , "What a thing is used for" , "Special task - role" .)