Stop offer for drink server (9)
I believe the answer is:
bartender
'drink server' is the definition.
'bartender' can be an answer for 'server' (I've seen this before). I'm not certain of the 'drink' bit.
'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'
'for' is the link.
Can you help me to learn more?
(Other definitions for bartender that I've seen before include "One who pulls pints" , "Server in pub" , "server of drinks?" , "Local worker" , "source of 9 [ROUND] ?" .)