The most common and most likely answer to this crossword clue is the 5 letter word REBUT
I've seen this crossword clue in The Guardian
R
E
B
U
T
More clues leading to the result REBUT
- Root around this counter
- Raised swelling is to explode
- Deny King Edward, for example, has returned
- Prove wrong potato perhaps has been sent back
- Give the lie to root in U-turn
- Contradict doubter abandoning party in revolution
- Deny King Edward, say, is making a comeback
- Explode: instrument going up, by the sound of it?
- Counter Murphy’s raised, for example
- Prove wrong about King Edward?
Buddy explains!

The straight part
We know that "Deny" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case deny = rebut.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 REBUT mean?
REBUT verb- To drive back or beat back; to repulse.
- To deny the truth of something, especially by presenting arguments that disprove it.