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' says to put letters next to each other.
'lawyer' becomes 'da' (district attorney).
'appears' says to put 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" .)