Over the moon, no longer living in outskirts of Enfield (6)
I believe the answer is:
elated
'over the moon' is the definition.
(I've seen this before)
'no longer living in outskirts of enfield' is the wordplay.
'no longer' becomes 'late' (I can't explain this - if you can you should give a lot more credence to this answer).
'living in' indicates putting letters inside.
'outskirts of' means to remove the middle letters.
'enfield' with its centre taken out is 'ed'.
'late' put inside 'ed' is 'ELATED'.
Can you help me to learn more?
(Other definitions for elated that I've seen before include "Exhilarated, highly excited" , "Greatly delighted and proud" , "In an enraptured state" , "Highly delighted" , "Puffed with success" .)