Crossword Genius

Entreated Calvin to change for a reasonable length of time (1,6,8)

Ross

I believe the answer is:

a decent interval

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'a reasonable length of time' is the definition.
I can't judge whether this definition defines the answer.

'entreated calvin to change' is the wordplay.
'to change' indicates an anagram.
'entreated'+'calvin'='entreatedcalvin'
'entreatedcalvin' anagrammed gives 'A DECENT INTERVAL'.

'for' is the link.

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I've seen this clue in the Sydney Morning Herald.
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