Not a tongue twister? Others aren't so lucky (4,3,3,2,3)

I believe the answer is:

easy for you to say

I'm a little stuck... Click here to teach me more about this clue!

'not a tongue twister? others aren't' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'so lucky' is the wordplay.
I cannot really understand how this works, but
'so' could be 'as' (e.g. phrases like 'not as tall' and 'not so tall') and 'as' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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.