Pub grub like this shouldn't be too fattening (5)
I believe the answer is:
local
'pub' is the definition.
(one's local pub)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for local that I've seen before include "Regional; a pub" , "(Pub) of the district" , "hearing" , "Stopping regularly" , "round the corner" .)