One who opposes fares is terribly restricted (8)

I believe the answer is:

resister

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'one who opposes' is the definition.
(someone who resists)

'fares is terribly restricted' is the wordplay.
'fares' becomes 'rester' (I can't justify this - if you can you should believe this answer much more).
'terribly' indicates an anagram.
'restricted' is an insertion indicator.
'is' with letters rearranged gives 'si'.
'rester' enclosing 'si' is 'RESISTER'.

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I've seen this clue in the Sydney Morning Herald.

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