If it's ear height it won't be the inertia reel system, that's anchored down at the floor pan, it might be something rubbing against the belt where it comes out from the B pillar. I would definitely take it to Renault pronto, or you could crash into a tree, hope it fails and you live and get an enormous settlement.
I feel so stupid the wife called me sad for doing this . I put a PVC patch where the belt rubs on the seat near the right shoulder and the belt rubbing on that was making the ticking
Now made up a cloth one .