One's yellow jersey, perhaps, found on a road (6)
I believe the answer is:
coward
'one's yellow' is the definition.
(yellow can mean cowardly)
'jersey perhaps found on a road' is the wordplay.
'jersey perhaps' becomes 'cow' (Jersey is a breed of cow).
'found on' means one lot of letters go next to another.
'road' becomes 'rd' (abbreviation for road).
'cow'+'a'+'rd'='COWARD'
(Other definitions for coward that I've seen before include "Author of 'Blithe Spirit'" , "Mad Dogs and Englishmen songwriter" , "Craven type" , "Faint-hearted person" , "Noel ..... composed musical 'Bitter Sweet'" .)