The most common and most likely answer to this crossword clue is the 7 plus 3 letter word CRYSTAL SET
I've seen this crossword clue in The Guardian
C
R
Y
S
T
A
L
S
E
T
More clues leading to the result CRYSTAL SET
- Sort of rock song collection put together for radio
- Radio: greet second and latest broadcast
- Harry Styles track endlessly played on this?
- Old radio‘s last cry?
- Clearly determined to provide early radio programmes
- Radio report’s latest broadcast
- Old receiver’s glass collection
- Comedian Billy at last acts the goat for radio?
- Receiver‘s glass collection
Buddy explains!
The straight part
We know that "Old radio" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case old radio = crystal set.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.