Restaurant's row about turnover (5)
I believe the answer is:
diner
'restaurant's' is the definition.
(diner is a kind of restaurant)
'row about turnover' is the wordplay.
'row' becomes 'din' (both can mean a loud disturbance).
'about' becomes 're' (common abbreviation for 'with reference to').
'turnover' is a reversal indicator.
're' reversed gives 'er'.
'din'+'er'='DINER'
(Other definitions for diner that I've seen before include "Railway carriage serving meals" , "American restaurant" , "US eatery" , "Eater" , "Small US restaurant" .)