What do you mean feels? is it slipping? graunching when you move off? juddering? not disengaging properly?
If it's slipping.... plates need replacing, probably £100+ depending on what plates you're after, surflex, carbon etc, your basket/drum could be worn also, bit neanderthal but you can file down the basket to get rid of the wear marks, but it's a sign it'll need replacing sooner or later.
Graunching is wear in general, strip and clean, get the dust out, check the plates, re-arrange the clutch pack helps etc. Same for juddering.
Not disengaging could be your clutch slave cylinder, check the seals see if there is any fluid leaking, could be air in the system.
Ask Nelly etc, he'll be able to give you a few pointers
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