Decorative line (6)
I believe the answer is:
stripe
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">decorative line</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 stripe that I've seen before include "Narrow band of colour" , "Band of colour, maybe of rank" , "Chevron on a uniform to denote military rank" , "Sleeve badge showing military rank" , "Braid showing military rank" .)