Say what you think is right — at heart famous serial needs to change (8)

'say what you think is right' is the definition.
I can't tell whether this definition defines the answer.

'heart famous serial needs to change' is the wordplay.
'heart' says to take the centre.
'needs to change' indicates an anagram.
The central letters of 'famous' are 'mo'.
'serial' with letters rearranged gives 'ralise'.
'mo'+'ralise'='MORALISE'

'at' is the link.

Can you help me to learn more?