New in version 2.3.
Detach clef marks attached to component:
abjad> staff = Staff("c'4 d'4 e'4 f'4")
abjad> clef_mark = contexttools.ClefMark('treble')
abjad> clef_mark.attach(staff)
ClefMark('treble')(Staff{4})
abjad> f(staff)
\new Staff {
\clef "treble"
c'4
d'4
e'4
f'4
}
abjad> contexttools.detach_clef_marks_attached_to_component(staff)
(ClefMark('treble'),)
abjad> f(staff)
\new Staff {
c'4
d'4
e'4
f'4
}
Return tuple of zero or more clef marks.