Thank you

Helllo
I'm translating an episode of this series and I have some incomprehensible sayings: (it's in Auckland new zealand).

The context is emergency exercise in the hospital:

She says: "Loud and clear". My quetion, does it mean "speak louder, I can't hear you", or is it a kind of Hello or a greeting?

in the middle of the exercise where fake injured keep coming in, suddenly a real wounded arrives and the nurse starts looking after him. she says:
"But that also *threw the clericals* because I kept coming saying "this is real, this is a real patient".
threw the clericals - does it mean that the clerks at the hospital were confused by the event?

"we're gonna do an update and do a press release before we call the exercise *stand down*"
Before we say it is finished? could it be also stand on? it's not clear in the video.

I know it's a lot of questions (and not easy ones)
and I am grateful for any attempt or clue.

If a person says, "I hear you 'loud and clear.'" It means just that. But I'd have to have more context to answer your question. It could be a command to someone: "Loud and clear."

Stand down = Main Entry: stand-down
Pronunciation: 'stan(d)-"daun
Function: noun

a relaxation of status of a military unit or force from an alert or operational posture (Merriam-Webster.com)

The others, I don't have a clue about.

You're correct about "threw the clericals" ... "threw" = threw for a loss, confused.
"Loud and clear" = I understand you perfectly.

Thank you Bob, thank you ESC, thanks to you I can declare stand down. You've been a great help to me (as always).
All my dreams fulfilled

That's what we like to hear.