Avoid Donald perhaps (4)
I believe the answer is:
Here is my best explanation:
This clue is a double definition.
'avoid' is the first definition.
(ducking is a kind of avoiding)
'donald perhaps' is the second definition.
(donald duck is a cartoon character)
(Other definitions for duck that I've seen before include "Bird - lower your head!", "Eg, eider; get down", "Use one's wits to get something", "Web-footed bird", "Water bird - get out of the way", "Mallard, say, or eider", "poor score?", "Steer clear", "Dip" and "Score of zero; bird".)