Amenable protest, when vowels have been switched (9)
I believe the answer is:
compliant
'amenable' is the definition.
(similar in meaning)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for compliant that I've seen before include "Manageable" , "Yielding to pressure" , "Obliging" , "Subservient" , "Submissive, acquiescent" .)