In conclusion, European Union holds very good record on energy (8)
I believe the answer is:
epilogue
'in conclusion european union holds very good record on energy' is the definition.
I can't judge whether this definition defines the answer.
'in conclusion european union' is the wordplay.
'in' is an insertion indicator.
'conclusion' becomes 'epilog' (I've seen this in another clue).
'european' becomes 'E' (abbreviation e.g. EU).
'union' becomes 'U' (common abbreviation as in 'Trades Union Congress').
'epilog'+'e'='epiloge'
'epiloge' placed around 'u' is 'EPILOGUE'.
Can you help me to learn more?
(Other definitions for epilogue that I've seen before include "Postscript to play, book etc" , "Final section (of play)" , "Short speech to the audience at the end of a play" , "Afterword" , "Short postscript" .)