Channel’s forthright in broadcast (6)

I believe the answer is:

strait

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'channel's' is the definition.
(strait is a kind of channel)

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

(Other definitions for strait that I've seen before include "Narrow strip of water between two larger ones" , "Narrow stretch of sea" , "Difficulty - strict" , "Narrow kind of traits" , "Sound" .)

I've seen this clue in The Times.

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