Pants measure (6)
I believe the answer is:
length
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">pants measure</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for length that I've seen before include "Extensiveness - measure" , "Linear dimension" , "End-to-end dimension" , "Linear extent" , "stretch" .)