Cryptic crossword clue
Foundations of life on radio — ‘diverting, robustly educational, informative’ — that’s him 4,5

The most common and most likely answer to this crossword clue is the 4 plus 5 letter word LORD REITH

I've seen this crossword clue in The Guardian
L
O
R
D
R
E
I
T
H

Buddy explains!

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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