Crossword Genius

Gloomy Sunday’s predecessor, a number for time of global revolution (9)

Ross

I believe the answer is:

saturnine

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

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

'sunday's predecessor a number for time of global revolution' is the wordplay.
I cannot really see how this works, but
'a' is found in the answer.
'number' could be 'turn' (synonyms) and 'turn' is present in the answer.
'sunday' could be 's' and 's' is located in the answer.
The remaining letters 'ine' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for saturnine that I've seen before include "may be brooding" , "dismal" , "Morose looking" , "Turn in sea makes one gloomy" , "Gloomy; dark and brooding" .)

I've seen this clue in The Times.
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