\version "2.11.46"

% In this example, the hairpin (broken by a line break) is placed too high in 
% the second staff, because apparently the clef gets in its way... How can I 
% avoid this?
\relative c'' { \dynamicUp \time 3/4 c\< c c\! | c\< c c  | \break
  c c c\! | c\< c c\! }