Disc barely covered by Kansas radio station (4)
I believe the answer is:
kiss
'radio station' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'disc barely covered by kansas' is the wordplay.
'barely' indicates the central letters (the word is bare of its external letters).
'covered by' is an insertion indicator.
'kansas' becomes 'KS' (abbreviation).
The middle letters of 'disc' are 'is'.
'is' inserted within 'ks' is 'KISS'.
Can you help me to learn more?
(Other definitions for kiss that I've seen before include "Affectionate greeting" , "Evidence of romance" , "drop of wax" , "Osculate" , "Smooch" .)