Edmund Clowney’s daughter, Rebecca Jones, is gathering all of her father’s audio sermons and lectures, and is requesting anyone who has audio files of Edmund Clowney to contact her at: perejones@sbcglobal.net.
We do have the the resources at Sermon Audio, Westminster Theological Seminary, Trinity Presbyterian Church, Christ the King Church, Westminster Seminary CA, and Reformed Theological Seminary.
Faith by Hearing will keep you posted as this material is collected and made available.
Here are a few:
http://www.wts.edu/resources/media.html?paramType=audio&filterTopic=&filterSpeaker=67&filterYear=