The most common and most likely answer to this crossword clue is the 4 plus 5 letter word HOUR GLASS
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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 HOUR GLASS mean?
HOUR GLASS noun- A clock made of two glass vessels connected by a narrow passage through which sand flows.
- A pointer, often shaped like an hourglass, indicating that the computer is busy.