Bold sound of operatic cycle in German (6)
I believe the answer is:
daring
'bold' is the definition.
(I've seen this before)
'sound of operatic cycle in german' is the wordplay.
'sound of operatic cycle in' becomes 'darin' (I am not sure about this - if you are sure you should believe this answer much more).
'german' becomes 'g' (abbreviation).
'darin'+'g'='DARING'
Can you help me to learn more?
(Other definitions for daring that I've seen before include "Adventurous courage" , "Venturesome" , "Courageous" , "Risque" , "Bold, willing to take chance" .)