A wire 200 yards long (5)

I believe the answer is:

cable

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'a wire' is the definition.
(I know that cable is a type of wire)

I cannot understand how the rest of the clue works.

(Other definitions for cable that I've seen before include "Rope for communication" , "Telegraph" , "Conductor for transmitting electric power" , "Hawser, wire" , "Strong suspension bridge made of wire" .)

I've seen this clue in The Globe and Mail.

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