Awful clan's radio rant (8)

I believe the answer is:

diatribe

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'radio rant' is the definition.
'diatribe' can be an answer for 'rant' (I've seen this before). I'm not sure about the 'radio' bit.

'awful clan's' is the wordplay.
'awful' becomes 'dia' (I can't explain this - if you can you should believe this answer much more).
'clan' becomes 'tribe' (synonyms).
'dia'+'tribe'='DIATRIBE'

Can you help me to learn more?

(Other definitions for diatribe that I've seen before include "Abusive harangue" , "I debar it, being a violent attack in words" , "Long speech" , "Bitter critical attack" , "slating" .)

I've seen this clue in the Sydney Morning Herald.

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