Ron! Zone provides values 1 and above (7)

I believe the answer is:

nonzero

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

'values 1 and above' is the definition.
I know nothing about this answer so I can't tell whether this works.

'ron zone provides' is the wordplay.
'provides' is an anagram indicator.
'ron'+'zone'='ronzone'
'ronzone' anagrammed gives 'NONZERO'.

Can you help me to learn more?

(Other definitions for nonzero that I've seen before include "Positive or negative, not 0" , "Either positive or negative" .)

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

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