Woman's top British scoundrel (6)
I believe the answer is:
blouse
'woman's top' is the definition.
(I've seen this before)
'british scoundrel' is the wordplay.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'scoundrel' becomes 'louse' (I've seen this in another clue).
'b'+'louse'='BLOUSE'
(Other definitions for blouse that I've seen before include "Lady's garment" , "Within a building" , "Woman's buttoned top" , "Female garment" , "Woman's "shirt"" .)