Prelude (12)
'prelude' is the definition.
(I know that prelude can be written as overture)
This is the entire clue.
(Other definitions for overture that I've seen before include "used in attempt to seduce?" , "Orchestral piece" , "Introductory music" , "Opera opening" , "Instrumental prelude" .)
'prelude' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for introduction that I've seen before include "Start" , "Preliminary presentation" , "Foreword" .)