No duties arranged, so patronises a restaurant (5,3)

I believe the answer is:

dines out

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'patronises a restaurant' is the definition.
I can't tell whether this definition defines the answer.

'no duties arranged' is the wordplay.
'arranged' is an anagram indicator.
'no'+'duties'='noduties'
'noduties' with letters rearranged gives 'DINES OUT'.

'so' acts as a link.

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I've seen this clue in The Irish Independent.

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