Dad is wrong in showing scorn (7)
I believe the answer is:
disdain
'scorn' is the definition.
(synonyms)
'dad is wrong in' is the wordplay.
'wrong' indicates an anagram.
'dad'+'is'='dadis'
'dadis' is an anagram of 'disda'.
'disda'+'in'='DISDAIN'
'showing' is the link.
(Other definitions for disdain that I've seen before include "Scorn - feeling of superiority" , "'Contempt, condescension (7)'" , "Arrogance" , "Contumely" , "Show scorn" .)