Eatery as top grub organisation? (9)
I believe the answer is:
gastropub
'eatery' is the definition.
(I know that gastropub is a type of eatery)
'as top grub organisation?' is the wordplay.
'organisation?' indicates an anagram (I've seen 'organisation' mean this).
'as'+'top'+'grub'='astopgrub'
'astopgrub' with letters rearranged gives 'GASTROPUB'.
(Other definitions for gastropub that I've seen before include "Eatery" , "Place for beer and good food" , "place of fine dining" , "Local with good food" , "Eaterie" .)