Set up for use (6)
I believe the answer is:
instal
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">set up for use</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 instal that I've seen before include "Give an office to" , "institute" , "Set up and put into use" , "Place equipment in position" , "Put in place and make ready for use" .)