Bobbed up, quite amazed by saw (9)
I believe the answer is:
curtseyed
'bobbed up quite amazed by saw' is the definition.
The answer and definition can be both to do with motion as well as being past participle verbs.
Perhaps you can see an association between them that I don't see?
'by saw' is the wordplay.
I cannot really see how this works, but
'saw' could be 'eyed' (I've seen this in another clue) and 'eyed' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for curtseyed that I've seen before include "Bobbed - bent the knee" , "Showed deference" , "what respectful girl did?" .)