The clue is: Old Card Game

There are 3 letters.
The second letter is O.

That is probably Loo

is that a card game?

Thank you for using the Jiskha Homework Help Forum. Indeed it is and here's a link to describe the game to you:

http://www.pagat.com/rams/loo.html

To solve this clue, we need to find an old card game with three letters where the second letter is O. One possible answer could be "Loo." However, it is always good to verify the answer by researching it further.

A quick search on the internet confirms that Loo is indeed an old card game. Loo is a trick-taking game that was popular during the 17th and 18th centuries. It is played with a standard deck of cards and involves bidding, trump suits, and winning tricks.

If you would like more information about the game and how to play it, you can refer to this link: http://www.pagat.com/rams/loo.html. This website provides a detailed description of the rules and strategies for playing Loo.