Crossword Genius

Black attire, we hear, for early part of day (7)

Ross

I believe the answer is:

morning

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'early part of day' is the definition.
(beginning of the day)

I can't explain the remainder of the clue.

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(Other definitions for morning that I've seen before include "Period up to noon" , "Time between dawn and noon" , "First part of day" , "Flower closing in the afternoon" , "early part of day" .)

I've seen this clue in The Times.
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