Partially complete document initially coming in ninety minutes after noon? (4-4)

I believe the answer is:

half-done

'partially complete' is the definition.
(half complete)

'document initially coming in ninety minutes after noon?' is the wordplay.
'initially' says to take the initial letters.
'coming in' indicates putting letters inside.
'ninety minutes after noon?' becomes 'halfone' (1:30 pm).
The first letter of 'document' is 'd'.
'd' put into 'halfone' is 'HALF-DONE'.

(Another definition for half-done that I've seen is " Well begun, they say".)

I've seen this clue in The Times.

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