Crossword Genius

Set out for run? Why upset the day? (6-4,5)

Ross

I believe the answer is:

twenty-four hours

'day?' is the definition.
('twenty-four hours' can be a synonym of 'day')

'set out for run? why upset' is the wordplay.
'upset' indicates an anagram.
'set'+'out'+'for'+'run'+'why'='setoutforrunwhy'
'setoutforrunwhy' with letters rearranged gives 'TWENTY-FOUR HOURS'.

'the' acts as a link.

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