Cryptic crossword clue
Electric signalling system chiefly by wired channels 3-2-4

The most common and most likely answer to this crossword clue is the 11 letter word FLY-BY-WIRE

F
L
Y
-
B
Y
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W
I
R
E

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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does FLY-BY-WIRE mean?

FLY-BY-WIRE noun
  1. A system that replaces the conventional manual flight controls of an aircraft with an electronic interface, especially on airliners.

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