Two cars don't start at Biblical mount (6)
I believe the answer is:
ararat
'biblical mount' is the definition.
(I've seen this before)
'two cars don't start at' is the wordplay.
'two cars' means two replacements for 'car'.
'car' becomes 'ar' (I can't explain this - if you can you should believe this answer much more).
'don't start' means to remove the first letter.
'car' with its first letter taken off is 'ar'.
'ar'+'ar'+'at'='ARARAT'
Can you help me to learn more?
(Other definitions for ararat that I've seen before include "Famous dry spot" , "Turkey's highest mountain" , "Noah's Ark landfall mt." , "Volcanic mount in eastern Turkey" , "Rowing blades" .)