Dianne upset another woman (6)
I believe the answer is:
nadine
'another woman' is the definition.
'Nadine' can be an answer for 'woman'. I'm not certain of the 'another' bit.
'dianne upset' is the wordplay.
'upset' is an anagram indicator.
'dianne' with letters rearranged gives 'NADINE'.
Can you help me to learn more?
(Other definitions for nadine that I've seen before include "French girl" , "South African writer" , "Woman" , "Girl's name; Dianne (anag.)" .)