Politician’s Dad you heard on series of items (8)
I believe the answer is:
populist
'politician's' is the definition.
(populist is a type of politician)
'dad you heard on series of items' is the wordplay.
'dad' becomes 'pop' (synonyms).
'heard' indicates a 'sounds like' (homophone) clue.
'on' means one lot of letters go next to another.
'series of items' becomes 'list'.
'you' is a homophone of 'u'.
'pop'+'u'+'list'='POPULIST'
(Other definitions for populist that I've seen before include "Pandering to public taste" , "Appealing to the masses" , "out to appeal to plebs" , "not favouring elite" , "Appealing to the majority" .)