Get over junk you shouldn't have internalised (6)

I believe the answer is:

obtain

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'get' is the definition.
(synonyms)

I can't explain the rest of the clue.

(Other definitions for obtain that I've seen before include "Come into possession of" , "Get or lay hold of" , "Get, procure" , "Get - secure" , "Gain possession of" .)

I've seen this clue in The Independent.

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