Content to include signals in blueprint (6)
I believe the answer is:
design
'blueprint' is the definition.
(I know that blueprint is a more specific form of the action design)
'content to include signals in' is the wordplay.
'content to' indicates the answer is hidden within the clue.
'DESIGN' is hidden within 'include signals in'.
(Other definitions for design that I've seen before include "project" , "Singed (anag.)" , "Drawing before an object is made" , "Contrive" , "Plan, blueprint" .)