Led a car around a crater (7)
I believe the answer is:
caldera
'crater' is the definition.
(I know that Caldera is a type of crater)
'led a car around a' is the wordplay.
'around' indicates anagramming the letters.
'led'+'car'='ledcar'
'ledcar' is an anagram of 'calder'.
'calder'+'a'='CALDERA'
(Other definitions for caldera that I've seen before include "Big hole in rock" , "Basin-shaped crater at top of volcano" , "Large volcanic crater -- lead car (anag)" , "Result of eruption" , "Large volcanic crater - race lad (anag)" .)