\score inside define-markup-command

[Michael Käppler]

Hi all,
is it possible to use the \score markup function in a new defined markup 
function construct?

For example,

#(define-markup-command (test layout props testclef) (string?)
  (interpret-markup layout props (markup #:score ( << \clef #testclef 
a4 h c >>
))))

This is invalid code because it mixes LilyPond and Scheme syntax. How 
can I achieve something similar to what's expressed in this dummy code 
piece?

Regards,
Michael