Challenge them to go up to grab discontented subversive and have them removed (6)

I believe the answer is:

erased

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'removed' is the definition.
(to erase is to remove or delete)

I don't understand the remainder of the clue.

(Other definitions for erased that I've seen before include "Obliterated" , "torn off" , "Removed by rubbing" , "removed recording" , "Rubbed out, expunged" .)

I've seen this clue in The Irish Times.

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