Put back in (9)
I believe the answer is:
reinstall
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">put back in</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 reinstall that I've seen before include "Again establish" , "begin program again" , "Replace" , "Put back in" .)