Orbits round bar (6)
I believe the answer is:
bistro
'bar' is the definition.
(I have seen 'French bar' mean 'bistro' so perhaps 'bar' could also mean 'bistro')
'orbits round' is the wordplay.
'round' indicates an anagram.
'orbits' anagrammed gives 'BISTRO'.
(Other definitions for bistro that I've seen before include "Small inexpensive eatery" , "Small restaurant - robs it (anag)" , "Intimate eatery" , "family concern perhaps" , "Coming out of restaurant" .)