does it have a hydraulic clutch? which gets it fluid supply from the brake fluid circuit. i work for peugeot and they have this set up on them and a pretty common fault on them is the clutch master cylinder fails on them and does not allow the pressure to press the clutch. there are 2 cylinders on the peugeot system,1 that is attached to the clutch pedal and goes through the bulkhead onto a plastic or metal pipe depending on the set up,the other cylinder usually goes onto the clutch fork at the gear box.it could also have a leak on part of the circuit that is assuming your car has a hydraulic clutch,hope this is of some use to you!!