Contrive, invent (6)
I believe the answer is:
design
This clue is a double definition.
'contrive' is the first definition.
(I know that contrive can be written as design)
'invent' is the second definition.
(thesaurus)
(Other definitions for design that I've seen before include "Purpose, pattern" , "Sketch, outline" , "Plan, blueprint" , "Blueprint, sketch" , "Singed (anag.)" .)