Modifying, changing (8)
I believe the answer is:
altering
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">modifying</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">changing</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(altering is a kind of changing)</span><br/ ><br/ ></span>
(Other definitions for altering that I've seen before include "Making changes" , "Changing -- 1 across (anag)" , "revising" , "Modifying, changing" , "making a change" .)