Newlyweds' holiday (9)
I believe the answer is:
honeymoon
'newlyweds' holiday' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for honeymoon that I've seen before include "Post-reception break" , "Sequel to marriage" , "Holiday of a newly married couple" , "Post-nuptial holiday" , "Holiday just for two?" .)