Crossword Genius

Responsibility lies in, for one reason, USA (4)

Ross

I believe the answer is:

onus

I'm a little stuck... Click here to teach me more about this clue!

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

'lies in for one reason usa' is the wordplay.
'ONUS' is hidden in amongst the letters.
However, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for onus that I've seen before include "Capulet opponent (R&J)" , "'Burden, of proof (4)'" , "'Burden, load (4)'" , "Weight of responsibility" , "Burden, duty" .)

I've seen this clue in the Sydney Morning Herald.
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