"Louder!”...and a clue to the starts of four Down answers (5,2)

I believe the answer is:

speak up

(Other definitions for speak up that I've seen before include "Make oneself heard" , "Raise your voice - can't hear you" , "Say things more loudly" , "Talk louder, can't hear you" , "State one's opinions boldly" .)

I've seen this clue in The Wall Street Journal.

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