Crossword Genius

One who's opposed ain't going to change (4)

Ross

I believe the answer is:

anti

I'm a little stuck... Click here to teach me more about this clue!

'one' is the definition.
Both the answer and definition are adjectives. Perhaps you can see an association between them that I can't see?

'opposed ain't going to change' is the wordplay.
'ain't' anagrams to 'ANTI'.
However, I'm not sure how this is indicated.

'who's' acts as a link.

Can you help me to learn more?

(Other definitions for anti that I've seen before include "Who pooh-poohs all" , "Adversary" , "An opponent - opposed to party policy, etc" , "Someone opposed (to a policy?)" , "Opposition member" .)

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