Where lies our responsibility (4)

I believe the answer is:

onus

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'responsibility' is the definition.
(onus is a duty or responsibility)

I can't explain the rest of the clue.

(Other definitions for onus that I've seen before include "Responsibilty" , "'Burden, of proof (4)'" , "Liability" , "Weight of responsibility" , "'Responsibility, task or burden (4)'" .)

I've seen this clue in The Globe and Mail and The Guardian.

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