Woman crazy in the morning, beginning to erupt (6)
I believe the answer is:
madame
'woman' is the definition.
(madame is a kind of woman)
'crazy in the morning beginning to erupt' is the wordplay.
'crazy' becomes 'mad' ('mad' can be a synonym of 'crazy').
'in the morning' becomes 'am'.
'beginning to' suggests taking the first letters.
The first letter of 'erupt' is 'e'.
'mad'+'am'+'e'='MADAME'
(Other definitions for madame that I've seen before include "Married woman abroad" , "Book by Flaubert" , "French Mrs" , "Title for a Frenchwoman" , "Frenchwoman's title" .)