Foundations of life on radio — 'diverting, robustly educational, informative' — that's him (4,5)
I believe the answer is:
lord reith
'radio diverting robustly educational informative that's him' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'foundations of life on' is the wordplay.
I cannot quite see how this works, but
'of' could be 'o' and 'o' is present in the answer.
'on' could be 're' ('on' can be mean 'with reference to') and 're' is found within the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for lord reith that I've seen is " broadcasting executive".)