In conversation daughter is having to use bad language about love (9)
I believe the answer is:
discourse
'in conversation' is the definition.
'discourse' can be an answer for 'conversation' (I've seen this before). I am unsure of the 'in' bit.
'daughter is having to use bad language about love' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'having' means one lot of letters go next to another.
'to use bad language' becomes 'curse' (I've seen this in another clue).
'about' means one lot of letters goes inside another.
'love' becomes 'o' (love means zero in tennis).
'curse' going around 'o' is 'course'.
'd'+'is'+'course'='DISCOURSE'
Can you help me to learn more?
(Other definitions for discourse that I've seen before include "Communication verbally" , "Written or spoken communication" , "Conversation, dialogue" , "Speech - conversation" , "(Formal) talk" .)