Car capital leaves nothing — just endless rubble (8)
I believe the answer is:
detritus
'rubble' is the definition.
(synonyms)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for detritus that I've seen before include "Waste, debris" , "More 22 Across, gravel made by erosion" , "Debris, dust" , "Accumulated debris" , "Accumulation of debris - it rusted (anag)" .)