Yes, it's possible in the Character pane. It's the icon with the cap T and the arrows beneath.

I tend to rely on a combination of condensing and negative tracking so it's not so obvious.

You can just set the horizontal scaling to 97% in the character panel, or, if copy fitting is your goal, you can allow glyph scaling in your justification options.

Worked wonderfully. I am very grateful.

Am slowly working my way out of the Quark mindset, and some things are just hard to find :-)

Can also be done as a part of a paragraph style.