Crossword Genius

Prompt action? (4)

Ross

I believe the answer is:

urge

I'm a little stuck... Click here to teach me more about this clue!

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" .)

I've seen this clue in The Globe and Mail and The Guardian.
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