Fourth or fifth TV programme? (3,4)
I believe the answer is:
top gear
'tv programme?' is the definition.
(British TV programme)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for top gear that I've seen before include "Speed is encouraged in such" , "Finest clothes" , "Fashion" , "For motorist, it could be fifth" , "series on TV" .)