Piper in command of terrified flight (5)
I believe the answer is:
panic
'terrified flight' is the definition.
The answer and definition can be both to do with motion as well as being verbs in their base form.
Maybe you can see an association between them that I can't see?
'piper in command' is the wordplay.
'piper' becomes 'pan' (I've seen this in another clue).
'in command' becomes 'ic' (military abbreviation).
'pan'+'ic'='PANIC'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for panic that I've seen before include "Sudden extreme anxiety" , "general alarm" , "Go to pieces" , "Lose one's nerve" , "Mass fear" .)