Clarke was not shy of delivering balls patently designed to scare opposing batsmen and make them look foolish, and was regularly capable of a perfect bouncer, which having pitched then cut away sharply to follow the path of a batsman's head as he swayed away from it. Having duly terrified the batsman, Clarke would often follow this up with a wicket-taking high speed yorker, which the shaken-up batsman was in no condition to defend. Alan Kourie recalls that Clarke, during the unofficial West Indies 1983 rebel tour, recorded speeds between 98 mph and 101 mph by two South African police officers testing out a new automobile speed radar gun who were present at Johannesburg ground.