One who backed Orban against a new candidate's extremist elements (5)

'one who backed orban' is the definition.
I know nothing about this answer so I can't judge whether this works.

'against a new candidate's extremist elements' is the wordplay.
'against' is a charade indicator (letters next to each other).
'a new' becomes 'n' (common abbreviation eg NT for New Testament).
'extremist' means to remove the middle letters (I've seen 'extremists' mean this).
'elements' becomes 'va' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'candidate' with its middle taken out is 'ce'.
'n'+'ce'='nce'
'nce' put after 'va' is 'VANCE'.

Can you help me to learn more?