Attractive person sitting on bar going topless for money (6)
I believe the answer is:
dollar
'for money' is the definition.
(US currency)
'attractive person sitting on bar going topless' is the wordplay.
'attractive person' becomes 'doll' (doll can mean an attractive woman).
'sitting on' is a charade indicator (letters next to each other).
'going topless' means to remove the first letter.
'bar' with its first letter removed is 'ar'.
'doll'+'ar'='DOLLAR'
(Other definitions for dollar that I've seen before include "Monetary unit in several countries" , "Philip -, English poet" , "The almighty currency, a buck" , "US currency" , "Economic factors deployed as 'soft power'" .)