Italian car designer upset at odd bits of trim (7)
I believe the answer is:
bugatti
'italian 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 am not certain of the 'italian' bit.
'designer upset at odd bits of trim' is the wordplay.
'designer upset' becomes 'bug' (I am not sure about this - if you are sure you should believe this answer much more).
'odd bits of' indicates alternate letters.
The alternate letters of 'trim' are 'ti'.
'bug'+'at'+'ti'='BUGATTI'
Can you help me to learn more?
(Other definitions for bugatti that I've seen before include "Early Italian car manufacturer" , "classic racing car" , "Ettore -, It. racing car designer" , "(Of horse) being used for breeding" , "Classic Italian car firm" .)