Towards the source (8)
I believe the answer is:
upstream
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">towards the source</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for upstream that I've seen before include "at an earlier stage in process" , "opposing current tendencies" , "away from estuary?" , "Going back to the source" , "Against a river's natural flow" .)