Possible Clues:

• Gets worried about returning party stuff oneself
• Old-fashioned type
• Dull material used to fill up?
• Heavy stuff, say, with little marks coming up
• Heavy starchy food
• It's heavy, as a matter of course
• G & T does transform dull food
• Stuff, tasteless or dull, gets eaten initially
• 'Heavy, starchy food (6)'
• This do gets so heavy as a matter of course