Reddish-brown back seat to car retains covers (10)
I believe the answer is:
terracotta
'reddish-brown' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'back seat to car retains covers' is the wordplay.
'back' says the letters should be written in reverse.
'covers' says the answer is hidden in the clue (I've seen 'covering' mean this).
'attocarret' can be found hidden inside 'seat to car retains'.
'attocarret' back-to-front is 'TERRACOTTA'.
Can you help me to learn more?
(Other definitions for terracotta that I've seen before include "Ornamental building material" , "sculpture" , "Pottery" , "brownish-red colour" , "casting" .)