Heraldic design (4,2,4)
I believe the answer is:
coat of arms
'heraldic design' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for coat of arms that I've seen before include "Heraldic shield" , "Armorial bearings" , "Sign of a family" , "Badge" , "Family insignia" .)