Crossword Genius

Employed American journalist (4)

Ross

I believe the answer is:

used

Here is my best explanation:

'employed' is the definition.
('use' can be a synonym of 'employ')

'american journalist' is the wordplay.
'american' becomes 'us'.
'journalist' becomes 'ed' (short for editor).
'us'+'ed'='USED'

This clue was last seen in Mirror