Very soggy duck in Johannesburg township (6)
I believe the answer is:
soweto
'johannesburg township' is the definition.
(I've seen this in another clue)
'very soggy duck' is the wordplay.
'very' becomes 'so' (both can mean 'extremely').
'soggy' becomes 'wet' (similar in meaning).
'duck' becomes 'o' (resembles zero - 'duck' in cricket).
'so'+'wet'+'o'='SOWETO'
'in' acts as a link.
(Other definitions for soweto that I've seen before include "Owes to the South African township" , "part of South Africa" , "South African township area" , "S. African urban area" , "Largest Black African urban settlement" .)