Crossword Genius

Slack water at dusk (8)

Ross

I believe the answer is:

eventide

I'm a little stuck... Click here to teach me more about this clue!

'dusk' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for eventide that I've seen before include "End of the day (poetic)" , "onset of dusk" , "The day's close (poetic)" , "some time later?" , "sunset" .)

I've seen this clue in The Globe and Mail.
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