Everyone around the Bluegrass state is radical (5)

I believe the answer is:

alkyl

'is radical' is the definition.
(I've seen this before)

'everyone around the bluegrass state' is the wordplay.
'everyone' becomes 'all' (all people).
'around' is an insertion indicator.
'the bluegrass state' becomes 'KY' (US postal abbreviation for Kentucky).
'all' enclosing 'ky' is 'ALKYL'.

(Another definition for alkyl that I've seen is " Radical".)

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