Prompt action? (4)
I believe the answer is:
urge
This might be a double definition.
'prompt' is the first definition.
(I've seen this in another clue)
'action?' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
Can you help me to learn more?
(Other definitions for urge that I've seen before include "Strongly encourage" , "Constrain" , "Press to take action" , "Implore" , "Propel, drive onward" .)