Idle criminal has siestas (3,5)
I believe the answer is:
lie-downs
'siestas' is the definition.
'idle criminal has' is the wordplay.
'criminal' indicates anagramming the letters.
'has' becomes 'owns' ('own' can be a synonym of 'have').
'idle' is an anagram of 'lied'.
'lied'+'owns'='LIE-DOWNS'
I've seen this clue in The Guardian.
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