good question... and technically, clock-less and risc are not related directly but seek the same end... simplification of architecture which will lead to faster execution, simpler circuit implementation and ease in programming.
but you are right... why use the word "risc"... it is just an american term to describe something opposite to unnecessarily complicated systems they themselves designed but want to keep for capitalist reasons... i will stop using "risc" and use something like "simplified design".
risc is simplification in instruction set and memory architecture... removing clock affects instruction execution, memory architecture, control program ( os ), i/o system, user programming and processor development... our project has added many innovations to this basis...