Pop group mostly put out over emcee's opening persuasive speech (9)
I believe the answer is:
eloquence
'persuasive speech' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for eloquence that I've seen before include "Fluency, persuasiveness" , "Gift of the gab" , "Fluency of expression" , "Powerful and effective language" , "Fluent speaking" .)