Public declaration of policy (9)
I believe the answer is:
manifesto
'public declaration of policy' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for manifesto that I've seen before include "See 6" , "Declaration of intentions by a political party" , "Soften aim (anag) - platform" , "Pre-election promises" , "party programme" .)