Coming back in September: a Ludo mega-event made up of several subdivisions (7)
I believe the answer is:
modular
'up of several subdivisions' is the definition.
I can't judge whether this definition defines the answer.
'coming back in september a ludo mega-event' is the wordplay.
'coming back' is a reversal indicator.
'in' says the answer is hidden in the clue.
'raludom' is hidden in the letters of 'september a ludo mega event'.
'raludom' in reverse letter order is 'MODULAR'.
'made' is the link.
Can you help me to learn more?
(Other definitions for modular that I've seen before include "Made from detachable pieces" , "Made of units" , "in several parts" , "Built from separate units" .)