I am trying to get this design:

To become this:


Unfortunately when I go to Object -> Mask or Clip I dont get the desired result. A wireframe shows the original path:


Please help.

Select the pink objects all and group them together (Ctrl+G)

Select the letter M and duplicate it (Ctrl+D)

Select the group and the duplicant atop, and set clipping.


Another one:
Draw a rectangle with the same fill colour of that M, move it to bottom (End),
group it with the pink objects,
and use the M shape for clipping.
This may render with crisper edges.

The M needs to be on top of the pattern.