Realise messenger's leaked material (7)

I believe the answer is:

seepage

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'realise messenger's leaked material' is the definition.
I can't judge whether this defines the answer.

'realise messenger's' is the wordplay.
'realise' becomes 'see' (synonyms).
'messenger' becomes 'page' (page is a kind of messenger).
'see'+'page'='SEEPAGE'

Can you help me to learn more?

(Other definitions for seepage that I've seen before include "Loss from slow leak" , "running out slowly" , "Percolation" , "narrow escape?" , "problem with tank" .)

I've seen this clue in The Guardian.

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