Shout very audibly at Tony? (5)
I believe the answer is:
blare
'shout' is the definition.
(thesaurus)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for blare that I've seen before include "Sound loud and harsh" , "Roar" , "Loud harsh noise" , "Strident sound" , "Sound loudly" .)