Beta Evo Clutch MC Dust Boot and slight loss of fluid

[cello]

My red MC cluch boot keeps popping out and I wonder if its meant to have a circlip or someting holding it in?

 

Also it drips a little oil , clutch works fine atm , albeit it snatches a bit at the end of the lever travel which makes modulation on tight turns a tad more difficult so I guess its the clutch plates that must be at the end of the usable  life. 

I tried to adjust the clutch free play today and noticed that it if i wind the piston winder in and disengage the clutch it makes a mecanical clatter! I did not ride it like that just wound it back out and got used to te on/off clutch.

Any words of wisdom out there ?