Discourage daughter over another relative (5)
I believe the answer is:
daunt
'discourage' is the definition.
(to daunt is to discourage or intimidate)
'daughter over another relative' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'over' means one lot of letters go next to another (in a down clue, some letters go over others).
'another relative' becomes 'aunt' (aunt is a type of relative. I am not sure about the 'another' bit.).
'd'+'aunt'='DAUNT'
Can you help me to learn more?
(Other definitions for daunt that I've seen before include "Make to feel intimidated" , "Discourage" , "Frighten, intimidate" , "Scare off - dismay" , "Cow" .)