The most common and most likely answer to this crossword clue is the 4 plus 9 letter word HIGH FREQUENCY
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Buddy explains!
The straight part
We know that "Broadcasting band/with great rate of repetition" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case broadcasting band/with great rate of repetition = high frequency.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 HIGH FREQUENCY mean?
HIGH FREQUENCY adjective- Of or pertaining to high frequency sound or other radiation.
- Occurring or doing something very frequently.