Assembly and clamping part

The invention relates to an assembly, particularly a façade cladding element assembly comprising: - a synthetic element, particularly a façade element, with an end and at least one hollow chamber that is continuous in the longitudinal direction; - a clamping part of a substantially strip-shaped resilient material, comprising at least one opening with on the edge lips that are situated opposite each other and extend from the strip and in a neutral position extend towards the opening, and which lips are provided with first hook members that extend outward from the lips, and second hook members that extend inward in the opening, and - an end part provided with at least one projecting part for attachment to the end of the synthetic element to provide its finish, wherein the clamping part with the lips extending in the hole is arranged on the end of the synthetic element, and the end part is subsequently arranged on the clamping part wherein the projecting part extends in the hole and through the opening, having mutual dimensions adapted such that the projecting part pushes the lips apart with the outward hook members clamping in the walls of the continuous hollow chamber and with the inward hook members clamping in the projecting part.