Behind the scenes worker making introduction (7,6)
I believe the answer is:
curtain raiser
'introduction' is the definition.
(thesaurus)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for curtain raiser that I've seen before include "warm-up" , "prelude to greater things" , "Preliminary play" , "preliminary to action" , "Introductory show" .)