Invents (7)
'invents' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for creates that I've seen before include "Complains" , "Brings into existence" , "Produces" , "coins" , "Generates" .)
(Other definitions for designs that I've seen before include "intended purposes" , "Plans" , "'Blueprints, patterns (7)'" , "Plots" , "Intentions" .)
'invents' is the definition.
('devise' can be a synonym of 'invent')
This is the entire clue.
(Another definition for devises that I've seen is " Invents".)