Daughter is ecstatic making protest (7)
I believe the answer is:
Here is my best explanation:
'protest' is the definition.
('dissent' can be a synonym of 'protest')
'daughter is ecstatic' is the subsidiary indication.
'daughter' becomes 'd'.
'ecstatic' becomes 'sent' (I've seen this in other clues).
'making' is the link.
(Other definitions for dissent that I've seen before include "Disagree", "Express a different opinion", "Not agree", "Dispute", "Difference of opinion - snidest (anag)", "Express disagreement", "Snidest (anag)", "A difference of opinion", "Protest" and "Withhold approval".)