Crossword Genius

New recruits mostly speak without thinking to begin with (8)

Ross

I believe the answer is:

converts

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'new recruits' is the definition.
The definition and answer can be both people as well as being plural nouns.
Perhaps they are linked in a way I don't understand?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

I've seen this clue in The Independent.
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