Crossword Genius

Not everybody in the Somerset side (4)

Ross

I believe the answer is:

some

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'not' is the definition.
Both the definition and answer are adverbs. Maybe there's a link between them I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for some that I've seen before include "Unknown or unspecified amount or number" , "certain" , "A little; not a little" , "Part" , "An unspecified quantity, not all" .)

I've seen this clue in the Evening Standard.
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