Making uniform late in the day (7)

I believe the answer is:

evening

I believe this is a double definition.

'making uniform' is the first definition.
(I've seen this before)

'late in the day' is the second definition.
(time of day)

(Other definitions for evening that I've seen before include "late party" , "Making flat" , "after dark?" , "Calming" , "Late time of day" .)

I've seen this clue in The Times.

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