Propose changes? Voter not in favour (7)

I believe the answer is:

opposer

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'voter not in favour' is the definition.
I can't judge whether this definition defines the answer.

'propose changes?' is the wordplay.
'changes?' is an anagram indicator (I've seen 'change' mean this).
'propose' is an anagram of 'OPPOSER'.

Can you help me to learn more?

(Other definitions for opposer that I've seen before include "One against something" , "Second speaker in debate" , "Adversary" , "One resisting" , "One who takes on" .)

I've seen this clue in The Times.

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