Arrange horse and go on sailor’s vacation (5,5)
I believe the answer is:
shore leave
'sailor's vacation' is the definition.
(I've seen this in another clue)
'arrange horse and go' is the wordplay.
'arrange' is an anagram indicator.
'and' means one lot of letters go next to another.
'go' becomes 'leave' (leaving is a kind of going).
'horse' is an anagram of 'shore'.
'shore'+'leave'='SHORE-LEAVE'
'on' is the link.
(Other definitions for shore leave that I've seen before include "Time off for sailors in port" , "rest of the crew" .)