Filling stations? (5)
I believe the answer is:
oases
'filling stations?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for oases that I've seen before include "Where there may be dates" , "Fertile tracts in a desert" , "Green desert spots" , "Fertile desert places" , "Fertile areas in deserts" .)