Stop rift on the radio? (5)

I believe the answer is:

brake

I'm a little stuck... Click here to teach me more about this clue!

'stop' is the definition.
(I know that brake is a type of stop)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for brake that I've seen before include "Restraint on vehicle" , "Thicket; estate car" , "Car stopper or thicket" , "Horse-drawn carriage" , "Thicket; fern; slow down" .)

I've seen this clue in The Times.

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