Very happy to make broth (4)
I believe the answer is:
soup
'broth' is the definition.
(thesaurus)
'very happy' is the wordplay.
'very' becomes 'so' (I've seen this in other clues).
'happy' becomes 'up' (I've seen this in other clues).
'so'+'up'='SOUP'
'to make' is the link.
(Other definitions for soup that I've seen before include "Eg, potage, broth" , "See 19" , "Eg, mulligatawny" , "Photographic developer" , "Liquid dish" .)