The most common and most likely answer to this crossword clue is the 5 letter word HERTZ
I've seen this crossword clue in Independent
H
E
R
T
Z
More clues leading to the result HERTZ
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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 HERTZ mean?
HERTZ noun- In the International System of Units, the derived unit of frequency; one (period or cycle of any periodic event) per second. Symbol: Hz