When you bleed the clutch, unbolt the slave unit from the engine and push the piston back fully back in. I usually use a G-Cramp to hold it fully in while bleeding the circuit.
I would normally back bleed and let the slave unit hang vertically to help air bubbles back up the hose. It also helps to remove the bleed nipple and wrap it with 4 or 5 turns of PTFE tape so that you don't let air back in when you slacken it off.
Once done, leave the master cylinder cap loose, zip tie the lever all the way back to the bars and leave it overnight. Tap the hose several times from the bottom up to loosen any remaining air bubbles.
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