Crossword Genius

Exist even when scattered over wide area (9)

Ross

I believe the answer is:

extensive

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'exist even when scattered over wide area' is the definition.
I can't judge whether this definition defines the answer.

'exist even when scattered' is the wordplay.
'when scattered' indicates an anagram (I've seen this in other clues).
'exist'+'even'='existeven'
'existeven' with letters rearranged gives 'EXTENSIVE'.

Can you help me to learn more?

(Other definitions for extensive that I've seen before include "Widespread" , "terribly large" , "Broad in scope" , "Covering much area" , "Covering a large area" .)

I've seen this clue in The Sun.
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