Medic protecting society members, heading off trickster (6)

I believe the answer is:

dodger

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'trickster' is the definition.
(dodger is a kind of trickster)

I can't explain the rest of the clue.

(Other definitions for dodger that I've seen before include "Roger, possibly" , "Dickens boy was an Artful one" , "Oliver's pal was an Artful one" , "Dickens created an Artful . . . . . ." , "Oliver is the artful one" .)

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