As an amateur he represented England in the flyweight division at the 1966 British Empire and Commonwealth Games in Kingston, Jamaica.
[4] From Walworth in London, Clark made his professional debut in October 1966, fighting a draw against Tommy Connor.
[5] Trained by Charlie Page at the Thomas a Becket gym,[6] he won his next 27 fights, and in April 1970 faced Alan Rudkin for the British bantamweight title and the vacant Commonwealth bantamweight title at the Royal Albert Hall.
He faced Paddy Maguire at the Royal Albert Hall, winning on points to become British champion.
He beat Chuck Spencer in March 1974, and Luigi Tessarin in May, but in the absence of adequate purse offers, relinquished his British title, and in August 1974 was forced to retire due to a detached retina in his right eye, while still the reigning European champion.