French clown's dirty broadcast on the radio (7)
I believe the answer is:
marceau
'broadcast on the radio' is the definition.
The definition suggests a singular noun which matches the answer.
'french clown's dirty' is the wordplay.
I cannot really understand how this works, but
'dirty' could be 'mar' (I've seen this in another clue) and 'mar' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for marceau that I've seen before include "Famous French mime artist" , "famous artist speechless" , "Marcel -, French mime artist" .)