Very keen supporter voted out on two points (7)
I believe the answer is:
devotee
'very keen supporter' is the definition.
'devotee' can be an answer for 'supporter' (I've seen this before). I am unsure of the 'very keen' bit.
'voted out on two points' is the wordplay.
'two points' means two substitutions for 'point'.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'on' means one lot of letters goes inside another (as in clothing 'on' a person).
'point' becomes 'E' (compass point).
'point' becomes 'e' (compass point).
'voted' is an anagram of 'dvote'.
'dvote' going around 'e' is 'devote'.
'devote'+'e'='DEVOTEE'
Can you help me to learn more?
(Other definitions for devotee that I've seen before include "A very loyal or loving person" , "Ardent follower and admirer" , "dedicated person" , "Keen fan" , "One strongly interested in something" .)