Seasoning for the girl's starter of broccoli (4)
I believe the answer is:
herb
'seasoning' is the definition.
(herb is a kind of seasoning)
'the girl's starter of broccoli' is the wordplay.
'the girl' becomes 'her' (**).
'starter of' says to take the initial letters.
The first letter of 'broccoli' is 'b'.
'her'+'b'='HERB'
'for' is the link.
(Other definitions for herb that I've seen before include "like Basil" , "'Sage or rosemary, say (4)'" , "Chives or coriander, say" , "Basil, for example, is one" , "man's name" .)