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Urge prison guard to leave airguns here (4)

Ross

I believe the answer is:

prod

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'urge' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

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(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" .)

I've seen this clue in The Irish Times.
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