In a certain language ‘lending would stall

Solution

Here the code contains 2 letters, one symbol and a number. First letter represents a next consonant of the first letter of the word. Then symbol represents no. of vowels (if no. of vowels is 1, then code $, if it is 2, then code #, if it is 3, then code @ and if it is 4, then code %). Next letter represents a previous vowel of second last letter of the word. Last number represents the no. of letters in the word multiplied by 3. In the word ‘Supreme’  S → t No. of vowels → 3 → @ Second last letters → previous vowel → i No. of the letters in the word →  7 × 3 → 21  ∴ Code : t@i21