As worn by the runner on the right? (5)
I believe the answer is:
skirt
'as worn by the' is the definition.
I can't tell whether this defines the answer.
'runner on the right?' is the wordplay.
'runner' becomes 'ski' (ski is a kind of runner**).
'on' is a charade indicator (letters next to each other).
'the right?' becomes 'rt'.
'ski'+'rt'='SKIRT'
Can you help me to learn more?
(Other definitions for skirt that I've seen before include "Fringe" , "Circumvent" , "Item of female apparel" , "Female garment" , "Go round; garment" .)