Musicians without the aid of safety precautions (5)
I believe the answer is:
nonet
'musicians without the aid of safety precautions' is the definition.
I can't judge whether this definition defines the answer.
'without the aid of safety precautions' is the wordplay.
'without' becomes 'no'.
'the aid of safety precautions' becomes 'net' (I can't justify this - if you can you should believe this answer much more).
'no'+'net'='NONET'
Can you help me to learn more?
(Other definitions for nonet that I've seen before include "Multi-figure composition" , "piece to be performed" , "Ennead" , "small band" , "Group of singers" .)