Shrill voice of loud singer introducing song sequence (8)
I believe the answer is:
falsetto
'shrill voice' is the definition.
'falsetto' can be an answer for 'voice' (falsetto is a kind of voice). I am not certain of the 'shrill' bit.
'loud singer introducing song sequence' is the wordplay.
'loud' becomes 'f' (short for forte - 'loud' in music).
'singer' becomes 'alto' (type of singing voice).
'introducing' means one lot of letters goes inside another (some letters introduced or inserted into others).
'song sequence' becomes 'set' (eg a band's set for a gig).
'alto' enclosing 'set' is 'alsetto'.
'f'+'alsetto'='FALSETTO'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for falsetto that I've seen before include "high notes?" , "Unusually high voice" , "Voice one's raised" , "Extra high male singing voice" , "Note production" .)