Sticking Clutch

After being stood in the garage over winter, the clutch on my Li 150 S (186 Mugello) is sticking. The scooter starts well, but stalls as soon as it's put in gear. I've tried kicking it with the clutch lever pulled in, and I've let it warm up in the hope that the plates will free, but it's still not freeing up.
Before I attempt to either strip it down, or (more likely) take it to a repairer, does anyone have any other suggestions of how to possibly get it rideable, at least so that I can take it to be mended.
Thanks
Before I attempt to either strip it down, or (more likely) take it to a repairer, does anyone have any other suggestions of how to possibly get it rideable, at least so that I can take it to be mended.
Thanks