It makes the secret public (7)

I believe the answer is:

leakage

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'it makes the secret public' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

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(Other definitions for leakage that I've seen before include "Unintended escape (of fluid)" , "Unwanted escape (eg of water or information)" , "Percolation" , "Escaping liquid or gas" , "Unwelcome flow" .)

I've seen this clue in The Irish News.

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