Tartan cloth (5)
I believe the answer is:
plaid
'tartan cloth' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for plaid that I've seen before include "Scots cloth - Welsh party" , "Tartan cloth, part of Highland dress" , "Tartan twilled cloth" , "Check fabric" , "Cloth for a Highlander" .)