Give a nudge to (4)
I believe the answer is:
'give a nudge to' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for prod that I've seen before include "Spur or goad" , "Poke - remind" , "Poke, stimulate into action" , "Poke with forefinger, stimulate" , "Stimulus" .)