The most common and most likely answer to this crossword clue is the 4 letter word PROD
I've seen this crossword clue in The Daily Telegraph
P
R
O
D
More clues leading to the result PROD
- Push skiver, finally, into school
- Encourage pop singer to record last of all
- Stimulus quietly provided with stick
- Squandering half away? Reminder given
- Dig for diamonds
- Poke piano with stick
- Apply pressure with stick
- Village abroad? One making return journey as reminder
- Nudge sheep’s behind with stick
- Poke right inside compartment
Buddy explains!

The straight part
We know that "Nudge" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case nudge = prod.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PROD mean?
PROD noun- A device (now often electrical) used to goad livestock into moving.
- A prick or stab with such a pointed instrument.
- A poke.
- A light kind of crossbow; a prodd.
- To poke, to push, to touch.
- To encourage, to prompt.
- To prick with a goad.
- A production.