Perform surgery (7)
I believe the answer is:
operate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">perform surgery</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 operate that I've seen before include "Carry on business" , "effect" , "Carry out surgery" , "Manage, run" , "Act in a theatre" .)