Book about processes (4,2)

I believe the answer is:

acts on

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'processes' is the definition.
The answer and definition can be both to do with social activities as well as being verbs in their -s form.
Perhaps they are linked in a way I don't understand?

'book about' is the wordplay.
'book' becomes 'acts' (book of the Bible).
'about' becomes 'on' (as in a book 'on' a certain topic).
'acts'+'on'='ACTS ON'

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