Substantial but dull food (6)
I believe the answer is:
stodge
(Other definitions for stodge that I've seen before include "Indigestible or dull food" , "Set dog (anag)" , "Food that's hard to digest" , "Heavy food (colloq.)" , "Heavy pud" .)
I believe the answer is:
stodge
(Other definitions for stodge that I've seen before include "Indigestible or dull food" , "Set dog (anag)" , "Food that's hard to digest" , "Heavy food (colloq.)" , "Heavy pud" .)