JoanH,
There can be several types of clustered charts in Excel.  For example, you
can have a clustered column which consists of a series of columns.  Or, you
can have a series of bars, which consists of horizonal bars.  Finally, there
are a number of combination charts that could be considered clustered.
To create a simple clusted column chart, set the data up on your spreadsheet
in a similar fashion to this (note two columns - one has names, the other has
data):
Dave	6
Frank	4
Kim 	7
Bill	6
Assuming the data set above is contained in the range A1:B4, select the
range.  Click on the Chart Wizard icon.  Under the standard types tab, choose
Column -> Clustered Column.