It's old news (7)

I believe the answer is:

tidings

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

'news' is the definition.
(I know that news can be written as tidings)

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

Can you help me to learn more?

(Other definitions for tidings that I've seen before include "Information about recent events" , "News (arch.)" , "News (obs.)" , "News, information" , "News, reports" .)

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

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