Conservatism is terrified internally by address (6)
I believe the answer is:
mister
'address' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'conservatism is terrified internally' is the wordplay.
'MISTER' is hidden in amongst the letters.
But, I am not sure how the hidden word is indicated.
'by' acts as a link.
Can you help me to learn more?
(Other definitions for mister that I've seen before include "Merits of form of address to man" , "Set rim (anag.)" , "Bloke" , "Form of address to a man, used without his name" , "that's what you'd call him" .)