Instrument of oppression (4)

I believe the answer is:

yoke

(Other definitions for yoke that I've seen before include "An oppressive and burdensome restraint" , "Frame joining draught oxen at the necks" , "Old harness or oppression" , "It joins two working animals together" , "Wooden crosspiece or burdensome restraint" .)

I've seen this clue in The Guardian.

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