blocktimer
 n.— «Greg Sanchez pledged assistance to Cortes, even as he clarified the broadcaster is not a regular employe[e] of the station but a blocktimer, who buys airtime.» —“Task force formed to probe shooting of Cebu broadcaster” by Mars W. Mosqueda Jr. Manila Bulletin (Philippines) June 14, 2003. (source: Double-Tongued Dictionary)