Instantly published? Correct (8)
I believe the answer is:
outright
'instantly' is the definition.
(I know that instantly can be written as outright)
'published? correct' is the wordplay.
'published?' becomes 'out' (a published book is 'out').
'correct' becomes 'right' (right can mean correct).
'out'+'right'='OUTRIGHT'
(Other definitions for outright that I've seen before include "Without reservation or stipulation" , "Without reservation or exception" , "Total" , "Without restriction or reservation" , "Completely and openly - say a win" .)