Big money, cigars … not one involved in this (8,3,7)

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8,3,7

britains gig economy

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'big money cigars not one involved in this' is the definition.
The definition suggests a singular noun which matches the answer.

'big money cigars not one involved' is the wordplay.
'one' becomes 'i' (Roman numeral).
'involved' indicates anagramming the letters (involved can mean confusing or complex).
'big'+'money'+'cigars'+'not'+'i'='bigmoneycigarsnoti'
'bigmoneycigarsnoti' with letters rearranged gives 'BRITAINS GIG ECONOMY'.

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I've seen this clue in The Guardian.

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