Book journey for honeymooner (5)
I believe the answer is:
bride
'honeymooner' is the definition.
(bride is a kind of honeymooner)
'book journey' is the wordplay.
'book' becomes 'b'.
'journey' becomes 'ride' (riding is a kind of journeying).
'b'+'ride'='BRIDE'
'for' acts as a link.
(Other definitions for bride that I've seen before include "woman in front of train" , "new union member" , "Marriageable woman" , "Wedding day woman" , "Groom's partner" .)