Heavy food? Eccentric gets to eat an excessive amount (6)
I believe the answer is:
stodge
'heavy food?' is the definition.
(I've seen this before)
'eccentric gets to eat an excessive amount' is the wordplay.
'eccentric' is an anagram indicator.
'to eat' indicates putting letters inside.
'an excessive amount' becomes 'OD' (overdose).
'gets' anagrammed gives 'stge'.
'stge' going around 'od' is 'STODGE'.
(Other definitions for stodge that I've seen before include "heavy fare" , "Heavy and indigestible food" , "Dull work" , "Steamed pudding" , "Food that's hard to digest" .)