Ed late coming in; delighted (6)
I believe the answer is:
elated
'delighted' is the definition.
(I've seen this before)
'ed late coming in' is the wordplay.
'coming in' is an insertion indicator.
'ed' placed around 'late' is 'ELATED'.
(Other definitions for elated that I've seen before include "Highly delighted" , "Blissful" , "Intensely delighted and proud" , "Happy and exicited, overjoyed" , "Thrilled" .)