Shine in a good bit of radio (7)
I believe the answer is:
glisten
'shine' is the definition.
('glisten' can be a synonym of 'shine')
'a good bit of radio' is the wordplay.
I cannot really understand how this works, but
'good' could be 'g' (abbreviation) and 'g' is found in the answer.
The remaining letters 'listen' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
'in' acts as a link.
Can you help me to learn more?
(Other definitions for glisten that I've seen before include "gloss" , "look bright" , "Glow from reflection" , "Shine or sparkle wetly" , "Singlet (anag.); tingles (anag.)" .)