Refusal by daughter to show sign of agreement? (3)
I believe the answer is:
nod
'sign of agreement?' is the definition.
(a nod can indicate agreement)
'refusal by daughter' is the wordplay.
'refusal' becomes 'no'.
'by' is a charade indicator (letters next to each other).
'daughter' becomes 'd' (genealogical abbreviation).
'no'+'d'='NOD'
'to show' is the link.
(Other definitions for nod that I've seen before include "slight bow" , "Lower one's head" , "Signify assent" , "Signal with the head" , "Gesture of agreement" .)