選択範囲のテキストを (* *) で囲みたいのですがうまく行きません。

tell application "System Events"

set oriClip to the clipboard

keystroke "x" using {command down}
set the clipboard to "(*" & (the clipboard) & "*)"

log (the clipboard)

delay 0.5
keystroke "v" using {command down}

set the clipboard to oriClip

end tell