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You could use VBA to return the entire contents of the cell to a Message Box. It would then show it in its entirety, and then would need to click on the OK message box in order to close it.
You could limit it to run on just a certain range. For example, if we only wanted to apply this to column G, our code would look like this:
VBA Code:
Private Sub Worksheet_SelectionChange(ByVal Target As Range)
' Only run if a single cell is selected
If Target.CountLarge > 1 Then Exit Sub
' Only run if a cell in column G is selected
If Not Intersect(Target, Range("G:G")) Is Nothing Then
MsgBox Target.Value
End If
End Sub
In order for this to work, it MUST be placed in the proper spot in the VBA Editor. The easiest way to ensure this is to go to the sheet you want to apply this code to, right-click on the Sheet tab name at the bottom of the screen, select "View Code" and paste the VBA code above into the VB Editor window that pops up. Then as long as you have VBA enabled on this workbook, this code will run automatically when you select any cell in column G.