It may be set for lunch (5)
I believe the answer is:
aspic
This could be a double definition.
'it' is the first definition.
The definition suggests a singular noun which matches the answer.
'set for lunch' is the second definition.
The definition and answer can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'may be' is the link.
Can you help me to learn more?
(Other definitions for aspic that I've seen before include "Clear meat or fish jelly" , "stock production" , "Savoury jelly for coating meat, eggs etc" , "Savoury relish" , "Lavender" .)