Scottish cloth (6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">scottish cloth</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tartan that I've seen before include "Scots patterned cloth" , "Scots plaid" , "Ship in Mediterranean" , "Distinctive pattern of a Scottish clan" , "Scottish costume design" .)
(Other definitions for tweed that I've seen before include "Scottish/English river" , "Thick woollen cloth - northern river" , "Boundary river" , "Rough woollen cloth" , "Rough material" .)