Born in Bridgeton, Glasgow Clark made his professional debut in November 1921, losing to Alec Boyes.
[2] In November 1924 he unsuccessfully challenged for Michel Montreuil's European title, but two months later beat the Belgian to become champion of Europe.
In January 1927 he challenged for The Ring world flyweight title against Fidel LaBarba at Madison Square Garden, losing a unanimous decision.
[5] Clark received lengthy hospital treatment for an eye injury sustained in the LaBarba fight, and having failed to defend in time was stripped of the British title on 7 April.
[6] After being pronounced fit to resume fighting at the end of October,[7] he was due to challenge Johnny Hill, who had won the British title while Clark was indisposed, but after his eye problems returned after sparring, he announced his retirement in November 1927.