Track on the radio produced by Shaggy (6)
I believe the answer is:
coarse
'shaggy' is the definition.
(thesaurus)
'track on the radio' is the wordplay.
'track' becomes 'course' ('course' can be a synonym of 'track').
'on the radio' indicates a 'sounds like' (homophone) clue.
'course' sounds like 'COARSE'.
'produced by' acts as a link.
(Other definitions for coarse that I've seen before include "Rough, harsh" , "Rough to the touch or lacking refinement" , "Vulgar; not fine" , "Unrefined; rough" , "needing refinement" .)