Constant conservative – moderate? Not so much (9)
I believe the answer is:
ceaseless
'constant' is the definition.
(I've seen this before)
'conservative moderate? not so much' is the wordplay.
'conservative' becomes 'C' (UK political abbreviation).
'moderate?' becomes 'ease' (moderate can mean to relax or ease).
'not so much' becomes 'less' (I've seen this before).
'c'+'ease'+'less'='CEASELESS'
(Other definitions for ceaseless that I've seen before include "keeps on running" , "Continual" , "Never-ending" , "Non-stop" , "Interminable" .)