In fact a singular bit of information (5)

I believe the answer is:

datum

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'bit of information' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for datum that I've seen before include "Given item" , "Basic fact" , "Fixed starting point for measurements" , "Unit of dope" , "Fact or stat" .)

I've seen this clue in The Globe and Mail.

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