To me a clone would be a copy of something but sold as a copy
A knockoff is a copy of something but sold as the original
Problems often arise when you get a knockoff of a clone, as with most stuff coming out of China and sold on eBay, and not talking of Audio gear with that last bit
Current setup Thorens TD-160 Mk1 with Denon DL-110 MC Cartridge, Pioneer PD-8700 CD Player, Yamaha AX-592 Amp, Yamaha CDX-810 CD Player, Yamaha KX-480 Cassette Deck, Yamaha TX-492RDS Tuner, Monitor Audio Bronze 5 speakers, Van-Damme Cables throughout.