The space between Clef and first-note is documented in the Internals References manual,
IR 3.1.26 Clef
You can modify the space-alist property for the first-note item. Either by changing the spacing-style to a stretchable (or semi-fixed) space or by reducing the value of minimum-fixed-space.
Thanks for pointing that out. It worked perfectly. Here's what I finally had:
\score {
\new Staff { c''2 r }
\layout {
ragged-right = ##t
indent = 0\cm
line-width = 1.5\cm
\context {
\Staff
\omit TimeSignature
\override Clef.space-alist.first-note = #'(minimum-fixed-space . 3.0)
}
#(layout-set-staff-size 14)
}
-----Jay