If its the same set up as the later (2004ish) Fiesta/Fusion, there is a retaining washer thing that connects the clutch pedal to the master cylinder. Its a known fault that they can fall off, you can fix it temporarily with cable ties etc, a new improved one at Ford cost me something like 25 pence! Symptom is a flappy pedal with no resistance whatsoever…it should be obvious when you get your head down in the footwell and look at the pedals.
Our recovery guy suggested that it looked like the master cylinder was weeping fluid which may have helped it fall off so we replaced that at the same time.
(On the diagram above there is a pin that connects the pedal to the piston where that hole is, it slips over the pin to hold it all together.)