Cocktail? Fix a soft drink before lawyer appears (4,6)
I believe the answer is:
pina colada
'cocktail?' is the definition.
(I've seen this before)
'fix a soft drink before lawyer appears' is the wordplay.
'fix' becomes 'pin' (to pin is to fix in place).
'soft drink' becomes 'cola' (cola is a kind of soft drink).
'before' is a charade indicator (letters next to each other).
'lawyer' becomes 'da' (abbreviation for District Attorney).
'appears' is a charade indicator (letters next to each other) (some letters appear after others).
'pin'+'a'+'cola'+'da'='PINA COLADA'
(Other definitions for pina colada that I've seen before include "Cocktail of rum, pineapple juice and coconut" , "Drink made of pineapple juice, coconut cream and rum" , "alcoholic one" , "rum-based potation" , "Perhaps contents of cocktail glass" .)