So elated about being deserted (8)
I believe the answer is:
desolate
'being deserted' is the definition.
(thesaurus)
'so elated about' is the wordplay.
'about' is an anagram indicator.
'so'+'elated'='soelated'
'soelated' with letters rearranged gives 'DESOLATE'.
(Other definitions for desolate that I've seen before include "extremely sad" , "Forlorn and unhappy" , "Utterly wretched" , "upset" , "alone" .)