Instrumental on cigar fabrication (7)

I believe the answer is:

organic

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

'instrumental' is the definition.
Both the definition and answer are adjectives. Maybe there's an association between them I don't understand?

'on cigar fabrication' is the wordplay.
'fabrication' indicates anagramming the letters.
'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 "without fertiliser" , "sort of farming" , "Grown without chemical fertilisers" , "Gin, Cora? (Anag)" , "Derived from natural sources" .)

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

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