Crossword Genius

The objective for people in general is to stop pollution and keep alive (7)

Ross

I believe the answer is:

sustain

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'keep alive' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for sustain that I've seen before include "Bear, hold, up" , "Uphold, strengthen" , "Carry" , "Strengthen; suffer" , "Provide nourishment" .)

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