Ways of controlling part of the orchestra (7)
I believe the answer is:
Here is my best explanation:
This clue 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 "Bowed instruments in the orchestra", "Just; trade exhibition", "Lengths of wire etc on a musical instrument", "Cords", "Undesirable conditions", "Section of an orchestra that plays violins, cellos" and "Orchestral section".)