The most common and most likely answer to this crossword clue is the 1 letter word H
I've seen this crossword clue in The Times
H
More clues leading to the result H
- F [loud] with UNCTION [obsequiousness] meeting A-LIST [bunch of celebs].
- King of Babylonia, father of Egypt and Greek character connected to disheartened Jewish leader
- At once needing animal doctor? He must come round
- Asian island frequency not used in four MHz broadcast
- H
- 11 EMERALDS/PHEASANT
- Hard Mike restrained by Robert’s powerful arm
- See 20 Across
- See 5 Down
- was our last in. Having a V already there as a checking letter, we assumed this was the ‘victory’ of the wordplay until the penny dropped. Our favourite today.
Buddy explains!

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 H mean?
H interjection- (chiefly Internet slang) Used as a filler response when one does not have a response to use. Almost always used by itself.
- A powerful and addictive drug derived from opium producing intense euphoria classed as an illegal narcotic in most of the world.
- A number system with base sixteen, using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E and F, most used in computing as a hexadecimal digit can represent four bits, half a standard byte.
- A number expressed in the hexadecimal system.
- A blow; a punch; a striking against; the collision of one body against another; the stroke that touches anything.
- Something very successful, such as a song, film, or video game, that receives widespread recognition and acclaim.
- An attack on a location, person or people.
- A collision of a projectile with the target.
- A match found by searching a computer system or search engine
- A measured visit to a web site, a request for a single file from a web server.
- An approximately correct answer in a test set.
- The complete play, when the batter reaches base without the benefit of a walk, error, or fielder’s choice.
- A dose of an illegal or addictive drug.
- A premeditated murder done for criminal or political purposes.
- A peculiarly apt expression or turn of thought; a phrase which hits the mark.
- A move that throws one of the opponent's men back to the entering point.
- A game won after the adversary has removed some of his men. It counts for less than a gammon.
- Landline (telephone in one's house)
- A time period of sixty minutes; one twenty-fourth of a day.
- A season, moment, or time.
- The time.
- (in the plural) Used after a two-digit hour and a two-digit minute to indicate time.
- (in the plural) The set times of prayer, the canonical hours, the offices or services prescribed for these, or a book containing them.
- A distance that can be traveled in one hour.