Specially signed drawing (6)
I believe the answer is:
design
'drawing' is the definition.
(design is a kind of drawing)
'specially signed' is the wordplay.
'specially' indicates anagramming the letters (I've seen this in other clues).
'signed' anagrammed gives 'DESIGN'.
(Other definitions for design that I've seen before include "Develop or prepare a plan" , "Plan, blueprint" , "Signed off on blueprint" , "Signed up for fashion plan" , "Prepare a plan for something to be made" .)