CLIPX="x"
Horizontal offset of a 'clip region', relative to the start of group, e.g.
CLIPX="60"
sets position to 1/10 inch when UNITS is 1/600 inch (default value).
Alternatively, an expression referring to the clip's position may be used, e.g.
CLIPX="CLIP.LEFT + 450"
Links:
CLIPY
CLIP