"Peace out" (5)
'peace out' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for later that I've seen before include "At a subsequent time" , "Alter (anag.)" , "bye" , "At a time in the future" , "there's more behind" .)
(Other definitions for deuces that I've seen before include "Twos in playing cards" , "Ties in tennis and twos in cards" .)