Going to be published before spring (8)
I believe the answer is:
outbound
'going to' is the definition.
(as in an outbound train)
'published before spring' is the wordplay.
'published' becomes 'out' (a published book is 'out').
'before' is a charade indicator (letters next to each other).
'spring' becomes 'bound' (both can mean to jump).
'out'+'bound'='OUTBOUND'
'be' acts as a link.
(Other definitions for outbound that I've seen before include "Going away" , "Being in the process of departing" , "Headed away from home base" , "Leaving" .)