About a right sort of light meal served here (7)
I believe the answer is:
carvery
'meal served here' is the definition.
(carveries serve roasts)
'about a right sort of light' is the wordplay.
'about' becomes 'ca' (abbreviation for 'circa').
'a right' becomes 'r' (common abbreviation).
'sort of light' becomes 'very' (Very light is a type of flare).
'ca'+'r'+'very'='CARVERY'
(Other definitions for carvery that I've seen before include "Buffet-style restaurant" , "Buffet with roasts" , "Buffet restaurant" , "likely to be hot at 19 across [REASTAURANT]" , "Buffet serving roast meats from the joint" .)