Maybe another solution could be to reduce the clef size, e.g.: \version "2.20.0"
\paper { line-width = 50 } \layout { indent = 0 system-count = 1 } << \new Staff { R2.*3 c''8 8 8 8 8 8 8 8 8 8 8 8 } \new Staff { R2. c''4 r r c'' r r r e'' r r d'' r } \new Staff { \clef F \time 3/4 R2.*3 \clef G g4 r r g r r \once\override Staff.Clef.X-extent = #'(-2 . 1) %\once\override Staff.Clef.space-alist = #'((staff-bar extra-space . 5)) %% or: \once\override Staff.Clef.space-alist = #'((staff-bar minimum-space . 2)) \once\set Staff.fontSize = #-1 \clef F } >> Pierre