Stop offer reaching publican (9)
I believe the answer is:
bartender
'publican' is the definition.
(thesaurus)
'stop offer' is the wordplay.
'stop' becomes 'bar' (bar can mean to stop or prevent).
'offer' becomes 'tender' (tender can mean to offer something).
'bar'+'tender'='BARTENDER'
'reaching' acts as a link.
(Other definitions for bartender that I've seen before include "He serves" , "Liquor salesman" , "One who pulls pints" , "One handling counter measures" , "Local worker" .)