As a replacement or alternative (7)
I believe the answer is:
instead
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">as a replacement</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">alternative</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for instead that I've seen before include "Rather - detains (anag)" , "As a substitute" , "use this as a replacement" , "as an alternative option" , "Alternatively" .)