Chomping on cigar, concerned with carbon compounds (7)

I believe the answer is:

organic

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'concerned with carbon compounds' is the definition.
I can't tell whether this definition defines the answer.

'chomping on cigar' is the wordplay.
'chomping' is an anagram indicator (letters get chomped or munched up).
'on'+'cigar'='oncigar'
'oncigar' is an anagram of 'ORGANIC'.

Can you help me to learn more?

(Other definitions for organic that I've seen before include "In cargo (anag.)" , "Fundamental" , "Derived from animal or vegetable matter" , "sort of farming" , "Pesticide-free" .)

I've seen this clue in The Guardian.

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