Politician time after time blocking support for moderate (9)
I believe the answer is:
temperate
'for moderate' is the definition.
('temperate' can be similar in meaning to 'moderate')
'politician time after time blocking' is the wordplay.
'politician' becomes 'mp'.
'time' becomes 'era' (I've seen this before).
'after time' becomes 'tete' (I can't justify this - if you can you should believe this answer much more).
'blocking' indicates putting letters inside (to block can mean to block in or contain).
'mp'+'era'='mpera'
'mpera' placed inside 'tete' is 'TEMPERATE'.
'support' is the link.
I am not very happy about this link. It may be part of another bit of the clue.
(Other definitions for temperate that I've seen before include "Abstemious" , "even" , "Showing self-restraint" , "Moderate, mild" , "With mild climate" .)