Your clutch may need to be replaced if it takes only a little pedal movement to disengage it. There should be an inch or two (2 to 4 cm) of free movement of the pedal before the clutch starts to disengage. If it disengages sooner, this is an indicator that your clutch is not riding (i.e., is not partially disengaged) when the pedal is not depressed.
This may be the result of an oil leak or even damaged electrical wiring (both serious, but not clutch-related issues), but it can also be a sign of a slipping clutch. Most of the time if you are towing a caravan or trailer on a steep hill and you smell a pungent smell coming from the engine it could mean the clutch is slipping.
Check the clutch fluid reservoir, which is located near the brake master cylinder. The reservoir should either be filled to the top or somewhere between the minimum and maximum lines shown on the reservoir. If necessary, add fluid to the reservoir.
A general rule when owning an older vehicle is to check and top up all fluids.