Track by a canal (7)
I believe the answer is:
towpath
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">track by a canal</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 towpath that I've seen before include "Canalside way" , "Track by waterway" , "Track beside a canal" , "canal feature" , "Riverside walk" .)