Crossword Genius

Working American’s responsibility (4)

Ross

I believe the answer is:

onus

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

'working american's' is the wordplay.
'working' becomes 'on' (on can mean working or activated).
'american' becomes 'us' (abbreviation for United States).
'on'+'us'='ONUS'

(Other definitions for onus that I've seen before include "albatross?" , "Burden, duty" , "Duty or responsibility" , "'Burden, load (4)'" , "Liability" .)

I've seen this clue in The Times.
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