Miatas have hydraulically engaged clutches and I don't know if they are are adjustable.
Is your Miata normally stored all winter? If that is the case you may just need to add some brake fluid to your clutch. Open the hood and just in front of the driver's position you will see two translucent reservoirs, the larger is for your brakes and the smaller one for your clutch. Be sure that both are between the low and full marks. I hope that is all it is!
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