Dealer's staff on special drinks (8)
I believe the answer is:
salesman
'dealer's' is the definition.
(thesaurus)
'staff on special drinks' is the wordplay.
'staff' becomes 'man' (as in staffing or manning a particular place).
'on' says to put letters next to each other.
'special' becomes 'S' (common abbreviation as in Special Air Service).
'drinks' becomes 'ales' (ale is a kind of drink).
's'+'ales'='sales'
'man' put after 'sales' is 'SALESMAN'.
(Other definitions for salesman that I've seen before include "''Death of a ...'' (drama by Arthur Miller)" , "He sells lean mass, strangley" , "Travelling rep" , "One selling goods" , "He sells goods and services" .)