Clutch Master Cylinder Leak

[MacJ]

I can see a small amount of oil around the clutch lever and mounting clamp on my 09 GS. The level of oil in the reservoir has fallen about 5 mm as well. I have cleaned it all off but its starting to reappear.
I've just had it serviced and the reservoir was topped up but no query raised by the mechanic.
The clutch is working fine but the leak is worrying. Has anyone experienced this?

 

[Bendy toy]

It sounds like a M/C seals failure. A low pressure system (as the clutch is) can cause the seals to collapse and pull air in or to leak fluid. Also check the fluid reservoir cup has not come loose in some way.