Perturbed, changed course (3,5)
I believe the answer is:
put about
'perturbed changed course' is the definition.
The definition suggests a verb in its base form which matches the answer.
This is the entire clue.
Can you help me to learn more?
(Other definitions for put about that I've seen before include "published" , "broadcast" , "made available" , "Spread information, or turn around like ship" .)