Broadcast court impounding RAF plane (8)
I believe the answer is:
aircraft
'plane' is the definition.
(I've seen this before)
'broadcast court impounding raf' is the wordplay.
'broadcast' becomes 'air' (to air on TV).
'court' becomes 'ct' (abbreviation used in road names).
'impounding' means one lot of letters goes inside another.
'ct' enclosing 'raf' is 'craft'.
'air'+'craft'='AIRCRAFT'
(Other definitions for aircraft that I've seen before include "flyers" , "Flying machine" , "Helicopters, gliders, etc." , "Eg, seven four seven or Airbus" , "Airbus A380 or Boeing 747 say" .)