Keep out of the pub (3)
I believe the answer is:
bar
I believe this clue is a double definition.
'keep out' is the first definition.
(I've seen this in another clue)
'the pub' is the second definition.
(both are drinking establishments)
'of' acts as a link.
(Other definitions for bar that I've seen before include "Pub; ban" , "Iron rod or drinks counter" , "Watering hole" , "Length of wood or metal - drinking place" , "Prohibit; counter" .)