Greta munches a Pacific nation's bean (8)
I believe the answer is:
garbanzo
'bean' is the definition.
The definition and answer can be both things that one consumes for nourishment as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'greta munches a pacific nation's' is the wordplay.
'greta' becomes 'Garbo' (Greta Garbo).
'munches' means one lot of letters goes inside another (inserted letters are eaten or munched).
'pacific nation' becomes 'nz' (abbreviation for New Zealand. I am not sure about the 'pacific' bit.).
'a'+'nz'='anz'
'garbo' enclosing 'anz' is 'GARBANZO'.
Can you help me to learn more?
(Another definition for garbanzo that I've seen is " Word from Spanish meaning chickpea".)