Ill-fated high-flyer in charge of a sport stadium originally (6)
I believe the answer is:
icarus
'ill-fated high-flyer' is the definition.
(Icarus flew too close to the sun in Greek myth)
'in charge of a sport stadium originally' is the wordplay.
'in charge of' becomes 'ic'.
'sport' becomes 'ru' (rugby union).
'originally' says to take the initial letters.
The initial letter of 'stadium' is 's'.
'ic'+'a'+'ru'+'s'='ICARUS'
(Other definitions for icarus that I've seen before include "Legendary Greek youth who flew too close to the sun and was killed" , "Excessively high flier" , "Failed flier" , "Daedalus's son" , "one on hazardous trip" .)