Drink like this with US prosecutor (4)
I believe the answer is:
soda
'drink' is the definition.
(I know that soda is a type of drink)
'like this with us prosecutor' is the wordplay.
'like this' becomes 'so' ('like so').
'with' means one lot of letters go next to another.
'us prosecutor' becomes 'da' (district attorney).
'so'+'da'='SODA'
(Other definitions for soda that I've seen before include "Fizzy drink - chemical compound" , "Drink containing carbonated water and sometimes flavouring" , "Fizzy water, goes well with whiskey" , ""Splashed" drinks mixer" , "Variety of pop" .)