Fish consumed in Belvoir regularly (7)
I believe the answer is:
bloater
'fish' is the definition.
(bloater is a kind of fish)
'consumed in belvoir regularly' is the wordplay.
'consumed' becomes 'ate' (eating is a kind of consuming).
'in' is an insertion indicator.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternating letters of 'belvoir' are 'blor'.
'ate' placed into 'blor' is 'BLOATER'.
(Other definitions for bloater that I've seen before include "Cured herring" , "Herring salted and smoked" , "food" , "Something fishy" , "that will more than fill one up" .)