Boxer seen in America, lippy (3)
I believe the answer is:
ali
'boxer' is the definition.
(Muhammad Ali)
'in america lippy' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ALI' is hidden within 'america lippy'.
'seen' acts as a link.
(Other definitions for ali that I've seen before include "Dickens novel" , "Ring' specialist" , "Muslim name" , "Muhammad - - , legendary boxer" , "Ringmaster" .)