Flyer (7)
'flyer' is the definition.
(I know that pilot is a type of flyer)
This is the entire clue.
(Other definitions for pilot that I've seen before include "Plane operator" , "-- Whale; -- light" , "Airman" , "Driver of aircraft" , "Steer, test (scheme)" .)
(Other definitions for radio that I've seen before include "Receiving apparatus" , "Broadcast medium" , "Marconi invented it" , "Speech receiver" , "Electronic receiver" .)
'flyer' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for leaflet that I've seen before include "Flyer, bill" , "Bill, pamphlet" , "Handout sheet" , "Sheet of paper giving information" , "It may advertise" .)