That's because there is no clipboard toolbar in Word for Mac.
You could create a custom toolbar that contained a similar set of
controls, but the macros to implement them could be somewhat complicated
given the differences between the Mac and WinOffice clipboard.
Depending on why you are looking for it you may find the Scrapbook and/or
the Spike features as suitable alternatives. Look them up in Word Help &
post back if you have any specific questions.