Part of flower, extremely sweet, with new name (6)
I believe the answer is:
stamen
'part of flower' is the definition.
('stamen' is part of 'flower')
'extremely sweet with new name' is the wordplay.
'extremely' says to hollow out the word (remove centre letters) (only the extremes of the word are used).
'with' is a charade indicator (letters next to each other).
'new' is an anagram indicator.
'sweet' with its middle removed is 'st'.
'name' anagrammed gives 'amen'.
'st'+'amen'='STAMEN'
(Other definitions for stamen that I've seen before include "Male ditto" , "Section of a flower" , "Part of a flowering plant" , "Male organ of plant" , "The pollen-bearing organ of flowering plants" .)