My definition of clownstep as put in the RSA vocabulary:
This is not really a drum 'n bass style. Originally, Dylan said about the track Bodyrock by Andy C & Shimon that it reminded him of dancing clowns. Who thought of the term 'clownstep' is a mistery, but it should refer to typical cheesy, happy jumpup tunes. Clownstep is often a naughty word to the true junglist, mainly because it's a term used by people who can't appreciate some of the new flows in dnb, although that's what dnb has always been about. RSA loves clownstep, fuck those moaners and let them get their anal action.