‘Kerning’ a clef

[Simon Albrecht]

Hello,

have a look at the attached image. I’d like the clef to take less space, 
especially to the right, and at best to overlap with the following note. 
How can I achieve that? extra-spacing-width obviously can only increase 
spacing, and the following doesn’t work either:

%%%%%%%%%%%%%
\version "2.19.31"
{
  a'8 \tweak Clef.space-alist.next-note #'(extra-space . 0) \clef bass 
a, b, c
}
%%%%%%%%%%%%%

TIA, Simon

kern-clef.preview.png
Description: PNG image