Stop where drink may be had (3)
I believe the answer is:
bar
'stop' is the definition.
(bar can mean to stop or prevent)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for bar that I've seen before include "Iron rod or drinks counter" , "Watering hole" , "Prohibit; pressure unit" , "Pub; ban" , "Rigid piece of metal" .)