Diamond-shaped pattern (6)
I believe the answer is:
argyle
'diamond-shaped pattern' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for argyle that I've seen before include "Lozenge-shaped design" , "Old Scottish county; part name of a W Country football team" , "Sock pattern" , "Design of diamond shapes, based on a Scottish clan tartan" , "See 10" .)