Crossword Genius

Ballet dancer unceremoniously ditches belt on schedule (8)

Ross

I believe the answer is:

calendar

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

'schedule' is the definition.
(I know that calendar is a more specific form of schedule)

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

Can you help me to learn more?

(Other definitions for calendar that I've seen before include "Chart showing months and days" , "Table of months and days" , "List of dates of land race" , "list of appointments" , "Date chart" .)

I've seen this clue in The Irish Times.
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