Design in canvas? (6)
I believe the answer is:
intent
'design' is the definition.
(I know that design can be written as intent)
'in canvas?' is the wordplay.
'canvas?' becomes 'tent' (canvas is a kind of tent).
'in'+'tent'='INTENT'
(Other definitions for intent that I've seen before include "Focused" , "Eager" , "set" , "Purpose; determined" , "Mean to" .)