Environmentally friendly sunbelt Asia developed (11)

I believe the answer is:

sustainable

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

'environmentally friendly sunbelt asia developed' is the definition.
I can't judge whether this definition defines the answer.

'sunbelt asia developed' is the wordplay.
'developed' is an anagram indicator.
'sunbelt'+'asia'='sunbeltasia'
'sunbeltasia' is an anagram of 'SUSTAINABLE'.

Can you help me to learn more?

(Other definitions for sustainable that I've seen before include "Able to be maintained" , "Able to continue over a period of time" , "Maintaining a balance by not depleting natural resources" , "It's a bus lane (anag.)" , "Able to be kept going" .)

I've seen this clue in The Telegraph.

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.