Yes, but only if you live in a country (or state) where online poker is licensed and regulated. According to PokerStars it allows one PayPal account per customer and allows for both deposits and withdrawals via PayPal. See PokerStars' real-money information page and cashier page to see if Paypal is an option for you.

PayPal is a trusted e-wallet accepted by many online poker providers. Whether you're scrolling through poker rooms or looking for a new place to play online poker for real money, you want to know that your money is safe. PayPal is a trusted e-wallet accepted by many online poker providers.

Calling The Clock is a rule used to discourage a player from taking an excessive amount of time by giving him/her a set amount of time to make a decision, or risk having his/her hand declared dead.

In a poker tournament, there is no time limit on players to make a decision. There comes a time, however, when delaying the tournament to make a decision (or tanking ) becomes an delaying option that players will use.