Imprisons cheat, adding penalties (8)

I believe the answer is:

confines

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

'cheat adding penalties' is the wordplay.
'cheat' becomes 'con' (con is a kind of cheat).
'adding' is a charade indicator (letters next to each other).
'penalties' becomes 'fines' (fine is a kind of penalty).
'con'+'fines'='CONFINES'

Can you help me to learn more?

I've seen this clue in The Irish Times.

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