A grub spot, possibly (9)
I believe the answer is:
gastropub
'a grub spot possibly' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'a grub spot possibly' is the wordplay.
'possibly' indicates an anagram.
'a'+'grub'+'spot'='agrubspot'
'agrubspot' anagrammed gives 'GASTROPUB'.
Can you help me to learn more?
(Other definitions for gastropub that I've seen before include "Place for beer and good food" , "Local converted into trendy restaurant" , "Local with good food" , "Eatery" , "Eaterie" .)