Bar for Oasis?
I believe the answer is:
watering-hole
I believe this clue is a double definition.
'bar' is the first definition.
(I've seen this before)
'oasis?' is the second definition.
(I've seen this before)
'for' is the link.
(Other definitions for watering-hole that I've seen before include "Oasis" , "Drinking place (for animals)" , "Public house (found in a desert?)" .)