Not one who yearns - not any more (2,6)
I believe the answer is:
no longer
'not any more' is the definition.
(I've seen this before)
'not one who yearns' is the wordplay.
'not' becomes 'no' (I've seen this in other clues).
'one who yearns' becomes 'longer' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'no'+'longer'='NO LONGER'
Can you help me to learn more?
(Other definitions for no longer that I've seen before include "One not disposed to pining" , "Not as formerly" , "a person without yearnings?" , "Someone who doesn't dream" .)