Crossword Genius

Donut and coke supply failed (6,3)

Ross

I believe the answer is:

conked out

'failed' is the definition.
('conk out' can be a synonym of 'fail')

'donut and coke supply' is the wordplay.
'and' says to put letters next to each other.
'supply' is an anagram indicator (in a supple way).
'donut' after 'coke' is 'cokedonut'.
'cokedonut' anagrammed gives 'CONKED OUT'.

I've seen this clue in The Independent.
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