Terrible person makes noise about Conservative freedom with no rest (9)
I believe the answer is:
scoundrel
'terrible person' is the definition.
(a scoundrel is a villainous person)
'noise about conservative freedom with no rest' is the wordplay.
I cannot quite see how this works, but
'about' could be 're' (regarding) and 're' is present in the answer.
'conservative' could be 'c' (UK political abbreviation) and 'c' is present in the answer.
'noise' could be 'sound' (I've seen this in another clue) and 'sound' is located in the leftover letters.
A single letter 'l' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'makes' is the link.
(Other definitions for scoundrel that I've seen before include "Bounder" , "Red consul may be a rogue" , "A rogue or dishonest person" , "Rat" , "bad egg" .)