Overjoyed to have upset beer over Edward (6)
I believe the answer is:
elated
'overjoyed' is the definition.
(I've seen this before)
'upset beer over edward' is the wordplay.
'upset' says the letters should be written backwards.
'beer' becomes 'ale' (type of beer).
'over' means one lot of letters go next to another (in a down clue, some letters go over others).
'edward' becomes 'ted'.
'ale' back-to-front is 'ela'.
'ela'+'ted'='ELATED'
'to have' acts as a link.
(Other definitions for elated that I've seen before include "Jubilant, happy and excited" , "Delighted, ecstatic" , "Jubilant, very pleased" , "In an enraptured state" , "Joyful, uplifted" .)