Ways of controlling part of the orchestra (7)
I believe the answer is:
strings
I believe this is a double definition.
'ways of controlling' is the first definition.
(as in the phrase 'no strings attached')
'part of the orchestra' is the second definition.
(Other definitions for strings that I've seen before include "Undesirable conditions" , "Bowed instruments in the orchestra" , "Lengths of wire etc on a musical instrument" , "Cords" , "Orchestral section" .)