Prospect of girl coming between Dad and Mum (8)
I believe the answer is:
panorama
'prospect' is the definition.
(I know that prospect can be written as panorama)
'girl coming between dad and mum' is the wordplay.
'girl' becomes 'nora' ().
'coming between' is an insertion indicator.
'dad' becomes 'pa' (both can mean one's father).
'and' says to put letters next to each other.
'mum' becomes 'ma' (ma can mean mother).
'pa'+'ma'='pama'
'nora' placed into 'pama' is 'PANORAMA'.
'of' acts as a link.
(Other definitions for panorama that I've seen before include "Am on a par (anag)" , "Scene, vista" , "Picture" , "Wide view of region" , "Wide view - TV programme" .)