City guides on the radio (5)
I believe the answer is:
leeds
'city' is the definition.
(Leeds is an example)
'guides on the radio' is the wordplay.
'guides' becomes 'leads' ('lead' can be a synonym of 'guide').
'on the radio' shows a homophone (sound like).
'leads' sounds like 'LEEDS'.
(Other definitions for leeds that I've seen before include "Championship team" , "Northern town" , "City near Bradford" , "Yorks city" , "City of northern England - castle of southern England" .)