Gorge on roast left by husband (7)
I believe the answer is:
overeat
'gorge' is the definition.
(I know that gorge can be written as overeat)
'on roast left by husband' is the wordplay.
'on' becomes 'over' (over can mean on top of).
'roast' becomes 'heat' (roasting is a method of heating or cooking).
'left by' indicates named letters should be taken away (word is left or abandoned by specified letters ).
'husband' becomes 'h' (abbreviation).
'heat' with 'h' taken away is 'eat'.
'over'+'eat'='OVEREAT'
(Other definitions for overeat that I've seen before include "Be gluttonous" , "Be greedy" , "Indulge in gluttony" , "Consume excessively" , "Gobble to excess" .)