Where top grub cooked receives top marks? (9)
I believe the answer is:
gastropub
I'm afraid I can't explain this answer.
Can you help me to learn more?
(Other definitions for gastropub that I've seen before include "place of fine dining" , "Local with good food" , "Eaterie" , "Local converted into trendy restaurant" , "Bogus trap (anag) -- somewhere good to eat and drink?" .)