Sounds are the most difficult things to diagnose without actually being present, and a bit tough to diagnose sometimes given ideal circumstances. When you say "clinking" I think metallic rattling, which could be anything in your exhaust coming apart, or it could be something come loose on the body. I've seen the aluminium bumpers shatter or corrode loose, making noises from clinks to clunks. There's a spring holding the e-brake cables up off the rear axle and if it comes apart, the cables can bump on the axle, which won't necessarily make a clink noise. The sway bar and shock mounts are notorious for making noise on 240s, but these are usually rattles felt and heard in the body, nothing as faint as what you're describing.
By your description I'm going to guess at the driveshaft. If you can get up under the car, I'd say go for a drive and then get the car on ramps or a jack, and feel your u-joints. If one of them is smoking, burn-your-hand hot, you've got a problem. A bad joint can make a squeak noise that could be thought of as a clink, in the right light. This would be engine load related (louder with more throttle) and the speed would be related to the vehicle speed.
My second guess, because you didn't actually SAY that it was vehicle speed related, would be your exhaust. Any of the mufflers or the catalytic converter could come apart inside, any of the hangers or clamps could break, etc. This could happen at one engine speed or over a pretty broad range, but the volume or frequency of noise wouldn't depend on engine speed or load very much - it would be there all the time.
Good luck! Matt
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