Clothed in idiosyncratic style hosting a new series of events (9)
I believe the answer is:
decathlon
'series of events' is the definition.
(I've seen this before)
'clothed in idiosyncratic style hosting a new' is the wordplay.
I cannot quite understand how this works, but
'a' is within the answer.
an anagram of 'clothed' is 'decthlo' which is located in the remaining letters.
'new' could be 'n' (abbreviation as in New Testament NT) and 'n' is present in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for decathlon that I've seen before include "Latched on to athletic competition of 10 events" , "Olympic athletics event" , "Athletic contest with ten different events" , "Event, or events" , "Competition comprising ten events" .)