An O`s youth team product, Clark signed his first professional contract with the club at the end of the 2016/17 season.
The defender made his debut for the O’s against Cheltenham Town on February 25th after impressing whilst out on loan at East Thurrock where he made a total of twenty-five appearances and scored 3 goals.
Clark also made nine appearances for the O’s in the 2016/17 season but has been restricted to just two thus far in 2017/18.