Crossword Genius

Water moving smoothly in latter part of day? (8)

Ross

I believe the answer is:

eventide

'latter part of day?' is the definition.

I don't understand how the remainder of the clue works.

(Other definitions for eventide that I've seen before include "sunset" , "The day's close (poetic)" , "latter part of the day" , "late in the day?" , "End of the day (poetic)" .)

I've seen this clue in The Times.
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