Crossword Genius

Fourth or fifth TV programme? (3,4)

Ross

I believe the answer is:

top gear

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'tv programme?' is the definition.
(British TV programme)

I can't explain the remainder of the clue.

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(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" .)

I've seen this clue in The Guardian.
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