Private is charged for release of substance (9)

I believe the answer is:

secretion

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'release of substance' is the definition.
'secretion' can be an answer for 'substance' (secretion is a kind of substance). I'm unsure of the 'release of' bit.

'private is charged' is the wordplay.
'private' becomes 'secret' (similar in meaning).
'is charged' becomes 'ion' (I've seen this in other clues).
'secret'+'ion'='SECRETION'

'for' is the link.

Can you help me to learn more?

(Other definitions for secretion that I've seen before include "Product of glandular activity" , "Discharge - is on Crete (anag)" .)

I've seen this clue in The Irish Times.

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