Picture of Dad (and not a Mum) (8)
I believe the answer is:
panorama
'picture' is the definition.
(panorama is a kind of picture)
'dad and not a mum' is the wordplay.
'dad' becomes 'pa' ('pa' can be a synonym of 'dad').
'and not' becomes 'nor' (I've seen this before).
'mum' becomes 'ma' ('ma' can be a synonym of 'mum').
'pa'+'nor'+'a'+'ma'='PANORAMA'
'of' acts as a link.
(Other definitions for panorama that I've seen before include "Total view (of subject)" , "Wide-angle view" , "Comprehensive survey" , "Broad view (of BBC TV?)" , "Wide view (from BBC TV?)" .)