Crossword Genius

Advantageous to be young with a lisp … (6)

Ross

I believe the answer is:

useful

'advantageous' is the definition.
(something advantageous is useful)

I don't understand how the remainder of the clue works.

(Other definitions for useful that I've seen before include "Capable of serving some purpose" , "Proficient; handy" , "Handy, serviceable" , "Make yourself . . . . . . - help out" , "Handy; very able" .)

I've seen this clue in The Guardian.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.