Growing possibility of a chariot crash! (7)
I believe the answer is:
haricot
'growing possibility' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'chariot crash' is the wordplay.
'crash' indicates anagramming the letters.
'chariot' is an anagram of 'HARICOT'.
'of a' acts as a link.
Can you help me to learn more?
(Other definitions for haricot that I've seen before include "French bean" , "Type of bean in a chariot" , "Variety of bean" , "kind of ragout" , "Vegetable" .)