Dodgy deal with assistant in Antipodean city (8)
I believe the answer is:
adelaide
'antipodean city' is the definition.
(I've seen this before)
'dodgy deal with assistant' is the wordplay.
'dodgy' is an anagram indicator (a dodgy or wrong order of the letters).
'with' says to put letters next to each other.
'assistant' becomes 'aide' (aide is a kind of assistant).
'deal' with letters rearranged gives 'adel'.
'adel'+'aide'='ADELAIDE'
'in' acts as a link.
(Other definitions for adelaide that I've seen before include "Queen < in opera" , "Antipodean city" , "19th century queen" , "Lead aide to Oz" , "Girl" .)