Leading sports car has a bevelled roof like a Beetle (6)
I believe the answer is:
scarab
'a beetle' is the definition.
(I know that scarab is a type of dung beetle)
'leading sports car has a bevelled roof' is the wordplay.
'leading' says to take the initial letters.
'has' means one lot of letters go next to another.
'roof' indicates taking the first letters (the letter at the top of the word).
The initial letter of 'sports' is 's'.
The first letter of 'bevelled' is 'b'.
's'+'car'+'a'+'b'='SCARAB'
'like' acts as a link.
(Other definitions for scarab that I've seen before include "old lucky charm" , "Sacred beetle of Eygpt" , "Ancient Egyptian symbol" , "Old abuse" , "Sacred beetle of ancient Egypt" .)