Measure of length (4)
I believe the answer is:
inch
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">measure of length</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 inch that I've seen before include "Just a bit?" , "Twenty five point four millimetres" , "Move along gradually" , "no great length" , "Creep, edge" .)