Crossword Genius

Part of something said before going to meeting (4)

Ross

I believe the answer is:

agma

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'part' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

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(Other definitions for agma that I've seen before include "final sound of shouting or swearing?" , "conclusion of something to do with pronunciation" , "sounds nasal" , "Lettered symbol" .)

I've seen this clue in The Times and The Sunday Times.
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