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Allow reactionary extremists, resulting in things going off course (4)

Ross

I believe the answer is:

awry

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

I don't understand the remainder of the clue.

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(Other definitions for awry that I've seen before include "Crooked- be wary" , "Askew, lopsided" , "Wrong -- twisted to one side" , "Wonky" , "Uneven, crooked" .)

I've seen this clue in The Irish Times.
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