Right about the real trouble with the car part (4,5)
I believe the answer is:
rear light
'the car part' is the definition.
(light at the back of a car)
'right about the real trouble' is the wordplay.
'about' indicates putting letters inside.
'trouble' indicates anagramming the letters.
'real' anagrammed gives 'earl'.
'right' going around 'earl' is 'REAR-LIGHT'.
'with' is the link.
(Other definitions for rear light that I've seen before include "estate needs one" , "safety device!" , "retrospectively this is illuminating" , "shiner" , "car component" .)