This thread is for the site lexicon, you can post if you think that it's on topic but it's not created for a big discussion.
What is cl? Cl is short for Centiliter and a way to measure volume.
1 cl is
In other measuring systems 1 cl is
0,04 US cups
0,11 Uk quarts
or 1 cl is
or 0,67 tablespoons
If I have missed something (I use metrics so I don't know them all) there is a converter here.