Put into circulation, perhaps (4)
I believe the answer is:
stir
'put' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for stir that I've seen before include "cooler" , "jail" , "Begin to move" , "Create revolutionary movement" , "Get moving" .)