Attorney to fix a soft drink first, then a cocktail (4,6)
I believe the answer is:
pina colada
'a cocktail' is the definition.
(I've seen this before)
'attorney to fix a soft drink first' is the wordplay.
'attorney' becomes 'DA' (District Attorney).
'to fix' becomes 'pin' (to pin is to fix in place).
'soft drink' becomes 'cola' (cola is a kind of soft drink).
'first' says to put letters next to each other.
'pin'+'a'+'cola'='pinacola'
'da' after 'pinacola' is 'PINA COLADA'.
'then' is the link.
(Other definitions for pina colada that I've seen before include "rum-based potation" , "Cocktail of rum, pineapple juice and coconut" , "alcoholic one" , "Perhaps contents of cocktail glass" , "Drink made of pineapple juice, coconut cream and rum" .)