The burden on America (4)

I believe the answer is:

onus

'the burden' is the definition.
('onus' can be a synonym of 'burden')

'on america' is the wordplay.
'america' becomes 'us' (abbreviation for the United States).
'on'+'us'='ONUS'

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

I've seen this clue in The Telegraph.

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