lets be honest, this issue probably has nothing to do with parking but instead it relates to a cranky owner who lost a dispute over a right of way. I'm assuming here by the way that residents are not abusing the right of way for parking.
Firstly, clamping is allowed on a statutory clamping place(and there is a long legal definition of what constitutes that) or
where the clamping place is a non-statutory clamping place, the vehicle is parked in contravention of the terms and conditions or restrictions or prohibitions applicable to parking in the place concerned
So to me, the issue is less about can you be clamped and more about can you park (for whatever reason) in the area concerned.
So what is a Right of Way? It's normally defined as
the legal right, established by usage or grant, to pass along a specific route through grounds or property belonging to another.
In this case, your first port of call should be the Court Order to see exactly what was and wasn't granted. Secondly I'd recommend contacting the National Transport Authority to see if the are satisified the owner has a right to clamp and is going about it correctly. However I do think you may have to get your solicitors involved here