Crossword Genius

Second person in Paris coming in to block piece of information (5)

Ross

I believe the answer is:

datum

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'piece of information' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for datum that I've seen before include "Little bit of information" , "Given piece of information" , "Basic fact" , "Single informative fact" , "Fact or stat" .)

I've seen this clue in The Telegraph.
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