Departing, I must take medal outside (5)
I believe the answer is:
going
'departing' is the definition.
('go' can be a synonym of 'depart')
'i must take medal outside' is the wordplay.
I cannot really see how this works, but
'i' is present in the answer.
'medal' could be 'gong' (informal term for a medal or prize) and 'gong' is found within the leftover letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for going that I've seen before include "Due to leave" , "Failing to stay" , "Moving away, departing" , "Available" , "State of turf" .)