Made an impressive show of petulance? (7)
I believe the answer is:
stamped
'made an' is the definition.
The answer and definition can be both related to change as well as being past participle verbs.
Maybe you can see a link between them that I can't see?
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for stamped that I've seen before include "Impressed" , "made an impression" , "Walked noisily or angrily" , "Brought the foot down loudly" , "trampled" .)