Distances (7)
I believe the answer is:
lengths
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">distances</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know this)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for lengths that I've seen before include "Distances (in horseracing)" , "Linear extents" , "Measurements from end to end" , "Longitudinal measures" , "Distances from end to end" .)