The invention concerns a method for clipping a wideband radio signal in the time domain at a predefined threshold defining the maximum magnitude of the signal, where a difference signal for clipping is determined and subtracted such that the difference signal concentrates spectral interference in one or more unused subcarrier outside the used band. The invention further concerns a clipping unit for clipping a wideband radio signal in the time domain at a predefined threshold defining the maximum magnitude of the signal, the clipping unit comprising signal processing means for performing the method of one of the previous claims. And the invention concerns a power amplifier unit comprising the clipping unit. The invention concerns also a network element like a node B comprising the clipping unit.