Vulgar programme on the radio (6)
I believe the answer is:
coarse
'vulgar' is the definition.
(I know that vulgar can be written as coarse)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for coarse that I've seen before include "Rough-hewn" , "Rude, base" , "Rough in texture, or vulgar" , "Rough or crude, lacking refinement" , "gross" .)