Say it's complete (5)
I believe the answer is:
utter
I believe this is a double definition.
'say' is the first definition.
(to utter something is to speak or say it)
'complete' is the second definition.
(both can mean total)
'it's' is the link.
(Other definitions for utter that I've seen before include "Positive" , "Complete; absolute" , "Total - speak" , "Unqualified - unadulterated" , "Give voice" .)