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You need to have silence AFTER the track, and the new segment should start with the audio in. Check though with the radio station or producer as some stations have specific requirements.
Also, ask them at what level they want the audio delivered. Some stations compress the hell out of their signal and need to drop program. You should be fin peaking at 0 db but ask if they require -10 or even -20 (video and tv standard).
Don't fret about asking the director these technical questions. Most understand that with all the different plateforms out there for production, there is bound to be confusion. In the end, you want to look thorough before the project airs, rather than a fool after.
Cheers
MacBook Pro FULL, 896HD, 828mkii, DP7... Just go to the web site and look at the pretty pictures ; )