Distinctive style or manner (4)
I believe the answer is:
vein
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">distinctive style</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">manner</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for vein that I've seen before include "Blood-carrying vessel" , "Seam of mineral" , "Leaf rib; ore layer in rock" , "Distinctive style" , "Part of the blood circulation system" .)