Oh blimey. Who said anything about requesting clearance?
OK then, how about:
Pilot: "ATS, Callsign, For ATZ Transit"
or
Pilot: "ATS, Callsign, ATZ Transit"
or
Pilot: "ATS, Callsign, Intend ATZ Transit"
or
Pilot: "ATS, Callsign, Request traffic information in accordance with Rule 39 to enable me to intelligently execute an ATZ Transit"
or
Pilot: "ATS, Callsign, Oh s*ddit, avoiding the ATZ "
Anyway, an AGCS operator may not provide Flight Information Service.