Hi all just cured the same problem recently..... found that the pedal would nor return fully after found out that the problem with mine was a brokern clutch pedeal bracket, where it fixes the pedal arm to the bulk head, awkward job to see, had to lay on my back and look up at the pedal from the footwell. could see that the welds on the bracket had snapped,
1. remove the master clutch cylinder 2 bolts, and one pipe,
2. dont forget to remove the small pin and slpit pin from the top of the clutch pedal arm.
3. renove ethe top bolt from the top of the bracket and the pedal bracket and arm should come off,
not got the use of a welder so i fabricated a repair by using some metal strips, used some smallnuts and bolts to fix the bracket, making sure not to obstruct the cable entry point for the clutch.
refitted, while i had the master cylinder off i cleaned it out and then bleed it,
fixed my clutch no problem hope this helps
merry christmas to all
Kwondo