State channel is not following The Curve (8)

I believe the answer is:

straight

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'curve' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

I can't explain the rest of the clue.

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(Other definitions for straight that I've seen before include "Without curve or bend" , "Respectable" , "Sat right in unbending way" , "Honest, not crooked" , "Poker hand of five consecutive cards" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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