Action that may be reversed? (4)
I believe the answer is:
deed
'action' is the definition.
(deed is a kind of action)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for deed that I've seen before include "Conscious act" , "What's done" , "documentary evidence" , "Heroic exploit" , "A conscious action" .)