Are supporters yet to prove the proposition wrong? (5)
I believe the answer is:
rebut
'are supporters yet to prove the proposition wrong?' is the definition.
I can't tell whether this definition defines the answer.
'yet to prove the proposition wrong?' is the wordplay.
'yet' becomes 'but' (synonyms).
'to' means one lot of letters go next to another (I've seen this in other clues).
'prove the proposition wrong?' becomes 're' (I can't explain this - if you can you should believe this answer much more).
'but' put after 're' is 'REBUT'.
Can you help me to learn more?
(Other definitions for rebut that I've seen before include "Give the lie to" , "Quash" , "Refure or disprove" , "Rebuff; deny" , "Check" .)