It's a German car; the desert dwellers (Middle East nationals) lose their first and last letters ("heart of" typically means the middle letter only but this setter plays a bit fast and loose as you are well aware).
Took a long time (even by process of elimination) to parse my LOI, the thematic 8d. An OMG moment when the penny dropped.
The similarly thematic 40a is rather funny IMO.
The "with a career" part of 8a still confuses me. Maybe it's a hint about pro rasslin'. Apparently the wrestler uses a watch as part of his shtick (that, thankfully, is courtesy of Google 🤣), so "watch" is a funny touch.