You may get flat spots on the tyres with it being in the same position for 6 months, you can get a special block you place under each wheel which distributes the weight. It'll smell a bit musty inside without getting warm much in wet or cold conditions.
If you are worried about someone driving it off remove the battery or anything else that'll make it awkward for a theif to start, on an old car for example, I'd remove the rotor arm but on a 182 anything that will immobilise it.
I doubt the clutch, engine, box, brakes or anything else will seize on a modern car like a clio in 6 months tbh. You'd be suprised but some cars sit in compounds for months before they are taken in by a dealership when new.
The disks may get a little rusty so check it through before driving it again and take it very easy for the first few miles.
When you get back maybe take it in for a minor service.
My cortina was layed up for 2 years 6 months in all weathers before I bought it, a new bettery was fitted and it passed an mot the next day. Cars are more resilliant than people give them credit for. Infact I've driven cars with no real probs in my last job that you could barely see through the windows of they are covered in green muck from being stood for so long under trees.
Enjoy your trip.
