Rubber wheel-covering (4)
I believe the answer is:
tyre
'rubber wheel-covering' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for tyre that I've seen before include "Wheel-hoop" , "Biblical town" , "Seaport once famed for its purple dye" , "Ring made of rubber" , "A spare one may be fat around the middle" .)