Crossword puzzle clue "this clue has six of them"

This clue has six of them

Campaign about which Rumsfeld said in 2003 "it could last six days, six weeks - I doubt six months"

The movie "Clue" has three of them

This clue has two of them (for short)

Tihs clue has too of them

A hexagon has six of them

An oz. has six of them

Hasn't a clue (oddly enough, since this is a clue)