Newlyweds' trip (9)
I believe the answer is:
honeymoon
'newlyweds' trip' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for honeymoon that I've seen before include "Newlyweds' holiday" , "Post-reception break" , "Early period of goodwill" , "Sequel to marriage" , "romantic break" .)