A classic car craze? Working at it (7)
I believe the answer is:
bugatti
'a classic car' is the definition.
'bugatti' can be an answer for 'car' (I have seen 'Vintage car' mean 'bugatti' so perhaps 'car' could also mean 'bugatti'). I'm unsure of the 'a classic' bit.
'craze? working at it' is the wordplay.
'craze?' becomes 'bug' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'working' indicates an anagram.
'at'+'it'='atit'
'atit' is an anagram of 'atti'.
'bug'+'atti'='BUGATTI'
Can you help me to learn more?
(Other definitions for bugatti that I've seen before include "Classic French car firm" , "Italian racing car pioneer" , "classic racing car" , "(Of horse) being used for breeding" , "Vintage car" .)