Mashed potato's about right for meal (3,5)
I believe the answer is:
pot roast
'meal' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'mashed potato's about right' is the wordplay.
'mashed' indicates anagramming the letters.
'about' indicates putting letters inside.
'right' becomes 'r' (common abbreviation).
'potatos' anagrammed gives 'potoast'.
'potoast' placed around 'r' is 'POT-ROAST'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for pot roast that I've seen before include "Slowly cooked meat" , "Meat cooked in a container" , "joint preparation" , "Dish of braised meat" .)