Roll containing a potato (7)
I believe the answer is:
roaster
'potato' is the definition.
The definition and answer can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'roll containing a' is the wordplay.
'roll' becomes 'roster' (roll can mean a list or roster).
'containing' indicates putting letters inside.
'roster' enclosing 'a' is 'ROASTER'.
Can you help me to learn more?
(Other definitions for roaster that I've seen before include "Chicken, perhaps" , "A resort (anag.)" , "Fowl for the oven" , "Oven chicken?" , "oven item" .)