I think you should be able to claim based on the fact that if the clutch never lasted the 3 months of the warranty it must have been so close to knackered when you got the car it would be classed as unfit for purpose.
It would have to take into account the milage you had done as most warranty`s would have a limit on this aswell.
It all comes down to A, the garage if they supplied the warranty or B, the company that supplied the warranty it its stand alone.
It needs someone to take on board the time frame you have had the car and not just the fact that a clutch is not covered under wear and tear. Its the usual case of getting to talk to someone who actually understands your issue as opposed to someone just reading t`s and c`s of a screen.
Fingers crossed its not painful a journey but should imagine you will get there in the end.