Top grub's served up about one here (9)
I believe the answer is:
gastropub
'here' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'top grub's served up about one' is the wordplay.
'served up' indicates anagramming the letters.
'about' means one lot of letters goes inside another.
'one' becomes 'a' (a thing is one thing).
'top'+'grubs'='topgrubs'
'topgrubs' is an anagram of 'gstropub'.
'gstropub' enclosing 'a' is 'GASTROPUB'.
(Other definitions for gastropub that I've seen before include "Bogus trap (anag) -- somewhere good to eat and drink?" , "Local with good food" , "Eatery" , "Eaterie" , "Place for beer and good food" .)