American pressman not new (4)
I believe the answer is:
used
'not new' is the definition.
(thesaurus)
'american pressman' is the wordplay.
'american' becomes 'us'.
'pressman' becomes 'ed'.
'us'+'ed'='USED'
(Other definitions for used that I've seen before include "Hand-me-down" , "Prepossessed, perhaps" , "Old" , "Utilised" , "Employed - exploited" .)