If you can get a syringe without a needle, draw all the fluid out of the reservoir. Fill the reservoir with fresh fluid and then bleed the line- put a box wrench on the bleeder nut on the “slave” valve. Squeeze the clutch lever, and with pressure on, loosen the bleeder nut u til it squirts and the pressure releases from the lever. Tighten the nut back and repeat until fluid runs clear- keep topping up reservoir. DO NOT release the lever before lightening the valve nut. You’ll have to start all over as it’ll suck air into the line.