Great joy comes from it alone (7)
I believe the answer is:
elation
'great joy' is the definition.
(I've seen this in another clue)
'from it alone' is the wordplay.
'from' indicates anagramming the letters (the anagram comes from the same letters).
'it'+'alone'='italone'
'italone' is an anagram of 'ELATION'.
'comes' acts as a link.
(Other definitions for elation that I've seen before include "exhibits successful pride" , "Toenail (anag) -- delight" , "Feeling of joy and pride" , "'High spirits, exhilaration (7)'" , "Feeling of joy for it alone" .)