Express disapproval about first track, one to be performed by whole orchestra (5)
I believe the answer is:
tutti
'performed by whole orchestra' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs can sometimes mean the same thing.
'express disapproval about first track one' is the wordplay.
'express disapproval' becomes 'tut' (I've seen this in other clues).
'about' means one lot of letters goes inside another.
'first track' becomes 't' (1st letter of 'track').
'one' becomes 'i' (Roman numeral).
'tut' enclosing 't' is 'tutt'.
'tutt'+'i'='TUTTI'
'to be' is the link.
Can you help me to learn more?
(Other definitions for tutti that I've seen before include "All (musical players)" , "With all instruments twenty four Acdn (music)" , "Composer of Carmina Burana" , "Everyone join in (mus.)" , "with instruments and singers together" .)