Pretty fine appearance (4)
I believe the answer is:
fair
'pretty' is the definition.
(both can mean beautiful or attractive)
'fine appearance' is the wordplay.
'fine' becomes 'f' (abbreviation).
'appearance' becomes 'air' (both can mean an impression or character).
'f'+'air'='FAIR'
(Other definitions for fair that I've seen before include "(Of weather) fine and dry" , "Impartial, so-so" , "legitimate" , "'Just, reasonable (4)'" , "Treating people equally" .)