Holiday, darling, on satellite (9)
I believe the answer is:
honeymoon
'holiday' is the definition.
(I know that honeymoon is a more specific form of the action holiday)
'darling on satellite' is the wordplay.
'darling' becomes 'honey' (I've seen this before).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'satellite' becomes 'moon' (moon is a kind of satellite).
'honey'+'moon'='HONEYMOON'
(Other definitions for honeymoon that I've seen before include "Post-matrimonial holiday" , "Sequel to marriage" , "First holiday after marriage" , "Newlyweds' holiday" , "Holiday of a newly married couple" .)