Last words (3,3,5)
(Other definitions for see you later that I've seen before include "Say one's staying in poker game for now, but" , "Goodbye for now" , "Au revoir" , "just popping out?" , "Cheers" .)
'last words?' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for epitaph that I've seen before include "Words inscribed on tombstone." , "Obituary" , "Statement of commemoration for a dead person" , "Dead' record" , "Grave message" .)