Clue from the West Australian Cryptic Crossword 13/5/2021:
"Don't act like a pro (6)"
I can see that "act" gives POSE", but how do you get to "OPPOSE"?
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I believe this is a cryptic definition. A "pro" usually means "professional", but here one needs to instead interpret it as "someone on the supporting side" (pro vs contra). If you act unlike someone who supports, you oppose.