Hey Dan,
I'm assuming your car is currently standard?
If so and your going for a stage 1 remap then the Tuner will customise the map to suit your car. They do this as each car is different due to age, mileage and the way it's driven. If tou combine the map with a sports exhaust and induction kit the standard clutch will still be fine :)
if you were going for mega power then you would have to get an updated clutch and even an updated turbo.
Hope iv helped :)
cheers
steve