One with rooted objections to the status quo? (7)

I believe the answer is:

radical

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'one with rooted' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for radical that I've seen before include "Complete" , "objections to current policy?" , "Person with extreme political views" , "Dial car in order to be drastic" , "Tending towards extreme political views" .)

I've seen this clue in The Globe and Mail.

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