need help on a riddle

Hello,
I'm stuck on a challenge.
It's called "leet"; you have to find a solution made only of min letters, and that satisfies a check function. I'm pretty sure I found the letters but I cant find the good anagram.
The letters are "aadeglnnrst".
I tried many anagrams already, like "radnetslang", "nerdatslang"... but I'm not native english speaker, and even with an anagram list I couldn't find the good one.
Someone who knows the solution told me that the word "slang" is not in the solution, but the letters are.
There are at least two words in the solution.
It's probably leet related, but not written in leet.
Thank you for helping me !