Dish, very happy (4)
I believe the answer is:
soup
'dish' is the definition.
(I know that soup is a type of dish)
'very happy' is the wordplay.
'very' becomes 'so' (both can mean 'extremely').
'happy' becomes 'up' (I've seen this in other clues).
'so'+'up'='SOUP'
(Other definitions for soup that I've seen before include "Stolen plate melted down" , "Eg, potage, broth" , "First course" , "Mulligatawny or borscht?" , "Liquid - course" .)