By-product (8)
I believe the answer is:
offshoot
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">by-product</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for offshoot that I've seen before include "Branch, derivative" , "Small branch growing from the main stem" , "Outgrowth or by-product" , "Business subdivision, say" , "new branch" .)