Used to reform, being put out (6)
I believe the answer is:
ousted
'put out' is the definition.
The answer and definition are different parts of speech. However, adjectives and past participle verbs occasionally define each other.
'used to reform' is the wordplay.
'reform' is an anagram indicator (letters in a new form).
'used'+'to'='usedto'
'usedto' with letters rearranged gives 'OUSTED'.
'being' acts as a link.
Can you help me to learn more?
(Other definitions for ousted that I've seen before include "Put out as of office or government" , "Dislodged" , "Put forcibly out of office" , "Expelled from office or power" , "Supplanted" .)