Format, design (6)
I believe the answer is:
layout
This clue is a double definition.
'format' is the first definition.
(thesaurus)
'design' is the second definition.
(I know that layout is a type of design)
(Other definitions for layout that I've seen before include "display" , "disposal together?" , "Arrangement of page, buildings, etc" , "Disposition" , "Plan" .)