Footballer essentially out for each uncovered runner (8)
I believe the answer is:
streaker
'uncovered runner' is the definition.
(a streaker runs around naked)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for streaker that I've seen before include "One running out of clothes?" , "A naughtily nude runner (8)." , "One running naked" , "Someone running naked in a public place" , "One who runs naughtily nude in public" .)