Urge prison guard to leave airguns here (4)
I believe the answer is:
prod
'urge' is the definition.
(I've seen this in another clue)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for prod that I've seen before include "Spur or goad" , "Poke; reminder" , "Poke with a stick" , "Goad, stimulate into action" , "Poke with forefinger, stimulate" .)