Is it possible to use Clarity with autosampler which is not listed in the Clarity controls list?

Most probably yes, the list contains only directly controlled autosamplers. In other words, those where it is possible to set the position and injection method using a computer. Nevertheless, Clarity allows basic synchronization (allow injection and start data acquisition) with arbitrary autosamplers equipped with appropriate control output and input. 

For more information about AS connection, refer to chapter 6 (Connecting Autosamplers) in the Getting Started.