Most of bar cheers, Indian dish being provided (5)
I believe the answer is:
raita
'indian dish being provided' is the definition.
I know nothing about this answer so I can't tell whether this works.
'most of bar cheers' is the wordplay.
'most of' means to remove the last letter.
'bar' becomes 'rail' (rail is a kind of bar).
'cheers' becomes 'ta' (both can informally mean thank you).
'rail' with its last letter taken away is 'rai'.
'rai'+'ta'='RAITA'
(Other definitions for raita that I've seen before include "Indian side-dish of yogurt and cucumber" , "Dishy thing" , "condiment from India" , "Indian yogurt dip" , "Indian food good as side-dish" .)