Five and one third tablespoons
For dry measurements:
There are approximately sixteen tablespoons in a cup.
16 / 3 = 5.33
So, there are 5-1/3 tablespoons in 1/3 cup.
If you don't have the measuring cup, that means you can get only the approximate result not the actual one. So fill the cup and as per your understanding, see the one third of it.