Cryptic crossword clue
Extended farewell from band on the radio 4,4

The most common and most likely answer to this crossword clue is the 4 plus 4 letter word LONG WAVE

I've seen this crossword clue in The Daily Telegraph
L
O
N
G
W
A
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Buddy explains!

The straight part
We know that "band on the radio" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case band on the radio = long wave.
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.

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