The most common and most likely answer to this crossword clue is the 4 plus 4 letter word HALF HOUR
I've seen this crossword clue in The Guardian
H
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More clues leading to the result HALF HOUR
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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 HALF HOUR mean?
HALF HOUR noun- A period of time equal to thirty minutes, half an hour.
- The time of thirty minutes past any particular hour.