Audible cheering is produced in a flash (9)
I believe the answer is:
lightning
'a flash' is the definition.
(lightning is a kind of flash)
'audible cheering is produced in' is the wordplay.
I cannot really understand how this works, but
'in' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for lightning that I've seen before include "Natural flash of light" , "Precaution against electrical storms" , "Natural electrical discharge" , "Electric discharge in the atmosphere" , "Very quick" .)