Crossword Genius

Time for a glass? (4)

Ross

I believe the answer is:

hour

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

'time' is the definition.
(hour is a kind of time)

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

Can you help me to learn more?

(Other definitions for hour that I've seen before include "Part of day" , "See 24" , "occasion" , "See 12" , "Sixty minutes" .)

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