Pen end of sentence (6,4)

I believe the answer is:

prison term

'sentence' is the definition.
(synonyms)

'pen end' is the wordplay.
'pen' becomes 'prison' (I've seen this in another clue).
'end' becomes 'term' (I've seen this before).
'prison'+'term'='PRISON TERM'

'of' is the link.

I've seen this clue in The Independent.

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