Intricate pieces from flugelhorn at Eisteddfod (6)
I believe the answer is:
ornate
'intricate' is the definition.
(thesaurus)
'pieces from flugelhorn at eisteddfod' is the wordplay.
'pieces' indicates a hidden word (I've seen 'piece of' mean this).
'ORNATE' is hidden within 'from flugelhorn at eisteddfod'.
(Other definitions for ornate that I've seen before include "Richly adorned and elaborate" , "Flash" , "Florid" , "Richly decorated, perhaps too much so" , "Detailed" .)